Multi-color light-emitting system driving method and apparatus, and backlight system

Abstract

The present invention provides a multi-color light-emitting system driving method and apparatus, and a backlight system. The multi-color light-emitting system driving method comprises: respectively performing centralized adjustment on the wavelengths of a plurality of light-emitting elements of each light-emitting color, so that the wavelengths of the plurality of light-emitting elements of each light-emitting color tend to be consistent; respectively performing consistency adjustment on the light-emitting brightness of the plurality of light-emitting elements of each light-emitting color, so that the light-emitting brightness of the plurality of light-emitting elements of each light-emitting color tends to be consistent; and mixing a plurality of light-emitting colors of light-emitting units according to a component ratio required by a target color temperature. In the technical solution of the present invention, by means of centralized adjustment of the wavelengths of the plurality of light-emitting elements of each light-emitting color, the light-emitting consistency is improved; furthermore, by means of brightness consistency adjustment, the uniformity is improved; the centralized adjustment of the wavelengths does not affect the inherent color gamut of the light-emitting elements, and the color gamut obtained after color mixing is wider; and color mixing according to the component ratio of the target color temperature achieves the maximum light-emitting brightness at a certain color temperature.

Description

Multi-color 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 multi-color 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 materials and processes. For a light emitting system composed of multiple LEDs, the emitted light is inconsistent due to the different wavelengths of the multiple LEDs.

[0003] In the prior art, in order to improve the consistency of light emission of multiple LEDs, a BIN operation is performed on the LEDs, i.e., classification is performed according to a certain parameter range, such as chroma BIN, which usually classifies LEDs with a continuous 5nm boundary. In this way, the wavelength fluctuation range of the LED is within 5nm when the LED is used. The classification and selection of the LED is time-consuming, and as the requirement for the classification of the wavelength is improved, the effective output rate of the LED is significantly reduced.

[0004] Due to the above wavelength fluctuation, in LED direct display technology, point-by-point correction is required. The point-by-point correction is to adjust the light emission brightness of each LED, so that the overall display consistency of pure color is achieved, i.e., the corrected LED works within the "greatest common divisor" range of the respective color coordinates.

[0005] For multi-color mixed LED direct display, the point-by-point correction is equivalent to adjusting the color gamut by mixing colors, and thus is a process of reducing the inherent color gamut of the self-emission display of each light emitting color LED, and the obtained color gamut is relatively narrow. SUMMARY

[0006] The present application provides a multi-color light emitting system driving method and device, and a backlight system, to solve the problem of high selection requirement of LEDs and narrow color gamut of multi-color mixing in the prior art.

[0007] To solve the above technical problems, the present application is implemented by the following technical solutions:

[0008] According to a first aspect of the present application, a multi-color light emitting system driving method is provided, the light emitting system comprising multiple groups of light emitting units, each group of the light emitting units comprising multiple light emitting elements, the light emitting colors of the multiple light emitting elements of each group of the light emitting units being different, and the driving method comprising:

[0009] concentrating adjustment of the wavelengths of the multiple light emitting elements of each light emitting color respectively, so that the wavelengths of the multiple light emitting elements of each light emitting color tend to be consistent;

[0010] The light emitting brightness of the multiple light emitting elements of each light emitting color is respectively adjusted to be consistent, so that the light emitting brightness of the multiple light emitting elements of each light emitting color tends to be consistent.

[0011] The multiple light emitting colors in the light emitting unit are mixed according to the required component ratio of the target color temperature.

[0012] Optionally, the wavelength of the multiple light emitting elements of each light emitting color is respectively adjusted to be consistent, and specifically includes:

[0013] An initial driving current is provided for the multiple light emitting elements.

[0014] The wavelength of each light emitting element is measured, and when it is inconsistent with the preset wavelength, the initial driving current corresponding thereto is adjusted so that its wavelength tends to be consistent with the preset wavelength.

[0015] Optionally, when it is inconsistent with the preset wavelength, the initial driving current corresponding thereto is adjusted so that its wavelength tends to be consistent with the preset wavelength, and specifically includes:

[0016] When it is inconsistent with the preset wavelength, the initial driving current corresponding thereto is adjusted in a step-by-step fine-tuning manner until its wavelength tends to be consistent with the preset wavelength.

[0017] Optionally, the light emitting brightness of the multiple light emitting elements of each light emitting color is adjusted to be consistent, and specifically includes:

[0018] The duty cycle of the light emitting element is adjusted to adjust the light emitting brightness of the light emitting element to tend to be consistent with the target light emitting brightness.

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

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

[0021] Optionally, after the multiple light emitting colors in the light emitting unit are mixed according to the required component ratio of the target color temperature, the method further includes:

[0022] The light emitting system is divided into multiple partitions, and the light emitting units in the multiple partitions are respectively color adjusted and light adjusted.

[0023] Optionally, the light emitting units in the multiple partitions are respectively color adjusted and light adjusted, and specifically includes:

[0024] The chroma of the light emitting units in the multiple partitions is adjusted respectively. When used as a backlight, the chroma of a certain partition is made to approach the main color of the image to be displayed in the corresponding area of the display panel, thereby reducing the consumption of color light that does not need to be transmitted and reducing energy consumption.

[0025] According to a second aspect of the present application, a multi-color light emitting system driving device is provided, the light emitting system comprising multiple groups of light emitting units, each group of the light emitting units comprising multiple light emitting elements, the light emitting elements in each group of the light emitting units having different light emitting colors, the driving device comprising:

[0026] a wavelength centralization adjustment module configured to perform centralization adjustment on the wavelengths of the light emitting elements of each light emitting color respectively, so that the wavelengths of the light emitting elements of each light emitting color are made to approach each other;

[0027] a brightness uniformization adjustment module configured to perform uniformization adjustment on the light emitting brightness of the light emitting elements of each light emitting color, so that the light emitting brightness of the light emitting elements of each light emitting color is made to approach each other;

[0028] a color mixing module configured to mix the multiple light emitting colors in the light emitting units according to the required component ratio of the target color temperature.

[0029] According to a third aspect of the present application, a backlight system is provided, comprising a multi-color light emitting system and a multi-color light emitting system driving device configured to drive the multi-color light emitting system.

[0030] The multi-color light emitting driving device is the multi-color light emitting system driving device described above.

[0031] According to a fourth aspect of the present application, an electronic device is provided, comprising:

[0032] a processor;

[0033] and a memory configured to store processor-executable instructions;

[0034] wherein the processor implements the steps in any of the methods described above by running the executable instructions.

[0035] According to a fifth 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 methods described above.

[0036] The multi-color light emitting system driving method and device, and the backlight system provided by the present application perform centralization adjustment on the wavelengths of the multiple light emitting elements of the light emitting system, so that the selection requirements for the light emitting elements are relatively low, and even if the wavelengths are relatively discrete, it does not matter, and the classification and screening time can be saved. Moreover, because the selection requirements for the light emitting elements are low, the failure rate of the light emitting elements is low, and the cost is reduced.

[0037] The multi-color light emitting system driving method and device and the backlight system provided by the application can expand the color gamut range of the multi-color light emitting system.

[0038] The multi-color light emitting system driving method and device and the backlight system provided by the application can expand the color gamut range of the multi-color light emitting system.

[0039] The multi-color light emitting system driving method and device and the backlight system provided by the application can expand the color gamut range of the multi-color light emitting system. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings.

[0041] Fig. 1 is a flow chart of the multi-color light emitting system driving method of an embodiment of the application;

[0042] Fig. 2 is a color gamut range diagram after wavelength centralization adjustment of an embodiment of the application;

[0043] Fig. 3 is a color gamut range diagram without wavelength centralization adjustment of the prior art;

[0044] Fig. 4 is a wavelength centralization adjustment diagram of an embodiment of the application;

[0045] Fig. 5 is a flow chart of the wavelength centralization adjustment of an embodiment of the application;

[0046] Fig. 6 is a curve diagram of the wavelength centralization adjustment of an embodiment of the application;

[0047] Fig. 7 is a flow chart of the multi-color light emitting system driving method of an embodiment of the application;

[0048] Fig. 8 is a flow chart of the multi-color light emitting system driving method of an embodiment of the application;

[0049] Fig. 9a is a display diagram of a display system corresponding to an embodiment of the present application;

[0050] Fig. 9b is a zoning luminance adjustment diagram of a multi-color light emitting system of an embodiment of the present application;

[0051] Fig. 10a is a display diagram of a display system corresponding to an embodiment of the present application;

[0052] Fig. 10b is a zoning luminance and chrominance adjustment diagram of a multi-color light emitting system of an embodiment of the present application;

[0053] Fig. 11 is a diagram of a driving device of a multi-color light emitting system of an embodiment of the present application;

[0054] Fig. 12 is a diagram of an electronic device of an embodiment of the present application;

[0055] Legend: 11 - wavelength centralization adjustment module, 12 - luminance uniformization adjustment module, 13 - color mixing module; 21 - processor, 22 - internal bus, 23 - network interface, 24 - internal memory, 25 - storage. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0057] 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 purpose of facilitating the description of 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 limiting the present application.

[0058] 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 technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0059] 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.

[0060] In the description of the present application, unless otherwise explicitly specified and limited, the term "connection" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection 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 terms in the present application can be understood according to the specific circumstances.

[0061] 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.

[0062] As mentioned above: LED due to its inherent characteristics of material, process, the wavelength of its emission is a range, usually measured by half-wave width. In order to reduce the error of multiple LED light, generally will be divided into BIN operation of LED, that is, according to certain parameter range classification, such as colorimetric BIN is often classified according to 5nm LED. The above classification has higher requirements on wavelength, that is, the product selection requirement is high, the product failure rate is high, and the product screening time is long; in addition, even if only one color product is selected, the wavelength will fluctuate within 5nm, and the light consistency is still not high enough.

[0063] In addition, for the multi-color mixed light system, it is necessary to correct each LED point by point, adjust the light intensity of each LED, which is equivalent to adjusting the color gamut by mixing color, which is a process of reducing the inherent color gamut of LED self-luminous. It will be described below.

[0064] In order to solve the above problems, in an embodiment of the present application, a multi-color light emitting system driving method is provided, wherein the multi-color 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.

[0065] As an implementation, the multi-color light emitting system can be 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.

[0066] As another implementation, it can also be a dual-color light emitting system, which can use two complementary colors to produce white light. Of course, for light emitting systems that do not require white light, two appropriate colors can be selected as needed.

[0067] Please refer to FIG. 1, the driving method includes:

[0068] S11: the wavelength of the multiple light emitting elements of each light emitting color is respectively concentratedly adjusted to make the wavelength of the multiple light emitting elements of each light emitting color consistent;

[0069] S12: the light emitting brightness of the multiple light emitting elements of each light emitting color is respectively uniformly adjusted to make the light emitting brightness of the multiple light emitting elements of each light emitting color consistent;

[0070] S13: multiple light emitting colors in the light emitting unit are mixed according to the component ratio required by the target color temperature.

[0071] The multi-color light emitting system driving method of the above embodiment first, through S11, the wavelength of the multiple light emitting elements of each light emitting color is respectively concentratedly adjusted, 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, saving the selection time; and 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, the fluctuation range is smaller, and the light emitting consistency is better than 5nm of a color degree. In addition, the light emitting brightness of the multiple light emitting elements of each light emitting color is respectively uniformly processed through S12, the brightness is more uniform, and the light emitting effect is better.

[0072] Further, the multi-color light emitting system driving method of the above embodiment expands the color gamut of the multi-color light emitting system through S11, which can make the color gamut of the multi-color light emitting system wider. The principle will be described below. Please refer to FIG. 2 for a color gamut range diagram after the wavelength concentration adjustment of the application. In this figure, taking 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 respectively reduced to a relatively small range, as shown in 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. Please refer to FIG. 3 for a color gamut range diagram when the wavelength consistency is not adjusted in the prior art. The light emitting elements after the three-color mixing are within the "greatest common divisor" range of their respective color coordinates, i.e. the triangular part marked with diagonal lines in the figure. From the comparison of the color gamut ranges of the two parts, it can be seen that the wavelength concentration adjustment of the application 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 scheme of the application can expand the color gamut range of the multi-color light emitting system.

[0073] As an embodiment, as for the RGB light emitting system, the wavelength of the light emitting element for R is concentrated and adjusted to be uniform in light emitting brightness, the wavelength of the light emitting element for G is concentrated and adjusted to be uniform in light emitting brightness, and the wavelength of the light emitting element for B is concentrated and adjusted to be uniform in light emitting brightness.

[0074] It should be understood that as long as the wavelength of the light emitting element for each color is concentrated and adjusted to be uniform in light emitting brightness, the order of adjustment is not limited. The wavelength of the light emitting element for each of R, G and B can be concentrated and adjusted first, and then the light emitting brightness of the light emitting element for each of R, G and B can be adjusted to be uniform. Alternatively, the wavelength and the light emitting brightness of the light emitting element for one color can be concentrated and adjusted first, and then the wavelength and the light emitting brightness of the light emitting element for the other two colors can be concentrated and adjusted in turn. Of course, the wavelength and the light emitting brightness of the light emitting element for each of the three colors can be concentrated and adjusted simultaneously.

[0075] As an embodiment, in the concentration and adjustment of the wavelength of the light emitting element for each color, the wavelength of the light emitting element is not necessarily the same value, but can fluctuate within a preset range. By way of example, referring to FIG. 4, the wavelength of 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. 4. The wavelength after adjustment is within the range of 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 small. If the light emitting consistency requirement is low, the fluctuation range can be set to be large.

[0076] As an embodiment, in the concentration and adjustment of the light emitting brightness of the light emitting element for each color, the light emitting brightness of the light emitting element is not necessarily the same value, but can fluctuate within a preset range. The specific 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 small. If the light emitting consistency requirement is low, the fluctuation range can be set to be large.

[0077] In an embodiment, referring to FIG. 5, the wavelength of the light emitting element for each color is concentrated and adjusted, which specifically includes:

[0078] S111: An initial driving current I is provided 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;

[0079] As an embodiment, the initial driving current can be determined according to the characteristics of the light emitting element and the target wavelength.

[0080] S112: measure the wavelength of each light emitting element, and determine whether the wavelength is consistent with the preset wavelength;

[0081] S113: when the wavelength is not consistent with the 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.

[0082] As an embodiment, S112 can be implemented in the form of successive current fine tuning.

[0083] The successive current fine tuning will be described in detail below by taking 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. 6, 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. 6, suppose that the wavelength of the 12th LED is measured to be 523 nm. The driving current of the 12th LED is then reduced by 2 mA step by step. The wavelength of the 12th LED is measured again after each reduction. The measurement of the wavelength is performed five times until the wavelength of the 12th LED is close to 527 nm. In the example, the current is fine tuned four times.

[0084] The above example is described by taking the measured wavelength to be 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 solution. The driving current can be increased by 2 mA step by step.

[0085] In the above embodiment, the successive current fine tuning is implemented by taking the successive fine tuning with a preset step as an example. The step of each fine tuning is the same. In different embodiments, the step of each fine tuning can be adjusted according to actual conditions. For example, when the measured wavelength is greatly different from the preset wavelength (e.g., the difference is greater than a first preset value), a large step can be used for adjustment first. When the measured wavelength is close to the preset wavelength (e.g., the difference is less than a second preset value), a small step can be used for adjustment.

[0086] 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 fine tuning.

[0087] 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. In different embodiments, different settings can be made.

[0088] Of course, in different embodiments, the adjustment of the driving current in S112 can also not be in the form of successive fine tuning. The ratio of the current corresponding to the light emitting element can also be calculated according to the ratio of the wavelength of the light emitting element to the preset wavelength. The current is adjusted to the right value at one time according to the ratio.

[0089] In different embodiments, the difference of the corresponding current of the light emitting element can also be calculated according to the difference between the wavelength of the light emitting element and the preset wavelength, and the current of the light emitting element is adjusted to the target value.

[0090] In one embodiment, the light emitting brightness of the light emitting elements of each light emitting color is adjusted to the target value in S12, 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 light emitting elements (target light emitting brightness).

[0091] Since the driving current of the light emitting element is determined after the wavelength consistency adjustment, it cannot be adjusted any more. The present application proposes to adjust the duty cycle of the light emitting element to adjust the light emitting brightness. If the light emitting brightness is adjusted to the target value by the duty cycle, the light emitting brightness of the light emitting element with the lowest light emitting brightness cannot be increased even if the duty cycle is 100%, so the light emitting brightness of the light emitting element with the highest light emitting brightness needs to be adjusted to the lowest light emitting brightness among the light emitting elements.

[0092] As an embodiment, the adjustment of the light emitting brightness of the nth light emitting element can be represented by the following relationship: L ri = K1 * I n * D n , wherein I n is the driving current value after the adjustment in S112, and D n is the duty cycle.

[0093] As an embodiment, the adjustment of the light emitting brightness of each light emitting element in S12 can also be performed by adjusting the duty cycle step by step.

[0094] The adjustment of the duty cycle step by step is described in detail below by taking an example. For the light emitting element with high light emitting brightness, the duty cycle can be reduced by 5% step by step, and the brightness is measured again after each reduction until the target light emitting brightness is approached.

[0095] 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.

[0096] In addition, in the above embodiment, the adjustment of the duty cycle step by step is implemented by taking the preset step by step as an example, 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.

[0097] Of course, in different embodiments, the adjustment of the duty cycle can not be in a step-by-step manner, but can be calculated according to the ratio between the luminous intensity and the target luminous intensity, and adjusted to the target value at one time.

[0098] In different embodiments, the difference between the luminous intensity and the target luminous intensity can also be calculated to obtain the difference between the duty cycle and the target duty cycle, and the duty cycle can be adjusted according to the difference to adjust to the target value at one time.

[0099] In an embodiment, S112 further includes storing the final current data of each light emitting element, and completing the color coordinate centralized calibration. S12 further includes storing the final duty cycle data of each light emitting element, and completing the brightness consistent calibration. For the light emitting system determined by the light emitting element, the above driving process is equivalent to 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.

[0100] The multi-color light emitting system of the above embodiment can be applied to backlight. After S11 and S12, the light emitting of each light emitting element is more consistent, and the light emitting of the entire backlight is also more consistent.

[0101] In the above embodiment, the multiple light emitting colors in the light emitting unit are mixed according to the component ratio required by the target color temperature after S13, the color temperature adjustment is realized, and the maximum white light brightness at a certain color temperature can be obtained. In an embodiment, S13 further includes storing the final component ratio data, and completing the color temperature calibration. For the light emitting system determined by the light emitting element, the above driving process is equivalent to initial driving calibration, which only needs to be completed once, and the subsequent process only needs to call the stored component ratio data.

[0102] As an embodiment, taking RGB as an example, the adjustment of the component ratio (i.e. color temperature duty cycle d) of the light emitting color in the light emitting unit in S23 can be expressed by the following relationship:

[0103] L B _ ri = K1*I Bn *D n *d B ,

[0104] L G _ ri = K1*I Gn *D n *d G ,

[0105] L R _ri = K1 * I Rn * D n * d R

[0106] wherein I Bn、 I Gn、 I Rn respectively represent the driving current values of the blue, green, red light emitting elements after adjustment, d B , d G , d R respectively represent the duty cycles corresponding to the blue, green, red colors at different color temperatures.

[0107] The above color temperature adjustment is described in detail below with an example. According to the brightness equation of BT2020, when the light of R, G, B three colors is 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 first two steps, the current values and working duty cycles of each light emitting element are obtained, but at this time the ratio of the maximum brightness of R, G, B after uniformization 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 uniformization brightness ratio of R, G, B is 1:2:1, the color temperature duty cycles d R ri G ri B ri = 0.2627:0.6780:0.0593; the 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 obtained at this time 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.

[0108] 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.

[0109] In an embodiment, it further comprises:

[0110] S31: dividing the multi-color 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.

[0111] ​​​​​​As an implementation, the light emitted by the light emitting units in the multiple partitions can be represented by the following relationship in S31:

[0112] L B _ ri = K * I Bn * D n * T Bn ,

[0113] L G _ ri = K * I Gn * D n * T Gn ,

[0114] L R _ ri = K * I Rn * D n * T Rn ;

[0115] wherein T Bn , T Gn , T Rn represent the duty cycles of blue, green, and red, respectively.

[0116] In an embodiment, the light emitted by the light emitting units in the multiple partitions is adjusted by adjusting the luminance of the light emitting units in the multiple partitions. When the duty cycles of the multiple colors change equally, for example, RGB, when T Bn , T Gn , T Rn change equally, the luminance of the light emitting units in the multiple partitions is adjusted.

[0117] In an embodiment, the light emitted by the light emitting units in the multiple partitions is adjusted by adjusting the chrominance of the light emitting units in the multiple partitions.

[0118] In an embodiment, S31 can be located after S13, and the light emitted by the light emitting units in the multiple partitions can be represented by the following relationship in S31:

[0119] L B _ ri = K * I Bn * D n * d B * T Bn ,

[0120] L G _ ri = K * I Gn * D n * d G * T Gn ,

[0121] L R _ ri = K * I Rn * D n * d R * T Rn .

[0122] The following will be described in detail with an example of the partitioned brightness adjustment. Please refer to FIG. 9a and FIG. 9b. In this embodiment, the multi-color light emitting system is applied to a backlight. FIG. 9a is a display image of a liquid crystal panel, and FIG. 9b is 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 backlight of the bottom of the candle and other black background, the brightness is reduced, which can further improve the contrast of the image.

[0123] 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 display 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, and if the mapping relationship is linear, the corresponding backlight partitioned brightness coefficient is "average value / 255";

[0124] As given in the above embodiment, the duty cycle T can be used to represent the brightness coefficient, that is, the brightness of a certain backlight partition is LZ 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 changes equally, that is, T Bn = T Gn = T Rn , so the color temperature of LZn is still 6500K.

[0125] The following is an example of partition chroma adjustment, please refer to Figures 10a, 10b. In this embodiment, the above driving system is applied to backlight. The liquid crystal panel displays color images by changing the transmittance T of different color pixels. As shown in Figure 10a, 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, i.e. the blue and green in the backlight in this area do not need to participate in image display, so this part of light is wasted. In this embodiment, the blue and green components in the backlight in the partition can be reduced by adjusting the partition chroma. As shown in Figure 10a, the value of the pixel RGB in point A is (255, 128, 32), at this time the brightness of point A is:

[0126] (255-128) / 255 parts of K*I are wasted Gn D n d G (255-32) / 255 parts of K*I are wasted Bn D n d B are wasted, i.e. the proportion of green light and blue light is low. By adjusting the backlight in the partition, the luminous brightness (i.e. chroma) of the blue and green corresponding light emitting elements in the partition 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%, so 50% of the green light power consumption and 87.5% of the blue light power consumption are saved, avoiding the waste of this part of power consumption and saving energy.

[0127] It should be understood that there are many ways to determine the low proportion: (1) it can be determined as low if it is lower than 255, for example, in the above embodiment, the green light and blue light are both determined as low, and the chroma of the green light and blue light is adjusted; (2) a proportion preset value can be set, and it is determined as low if it is lower than the proportion preset value, for example, if the proportion preset value is 130, then the green light and blue light are both determined as 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 is determined as low, and the chroma of the blue light is adjusted; (3) it can also be set that only the lowest proportion is determined as low, then only the blue light is determined as low, and the chroma of the blue light is adjusted.

[0128] For the color of the low proportion of light, there are also many ways to adjust the chromaticity: (1) the proportion of the light color can be judged by the ratio of the proportion of the light color and 255 to determine the size of the chromaticity adjustment; (2) the proportion of the preset value range and the corresponding chromaticity adjustment preset value can also be set, when the proportion value is in the proportion of the preset value range, the chromaticity is adjusted according to the corresponding chromaticity adjustment preset value, such as: assuming that the proportion of the preset value range is 【100-130】, the corresponding chromaticity adjustment preset value is 55%, then the proportion of the above green light is in the range, the green light is reduced to 55%; The proportion of the preset value range can be set, such as in addition to the above 【100-130】, the proportion of the preset value range 【30-60】 can be set again, and the corresponding chromaticity adjustment preset value is 15%, then the proportion of the above blue light is in the range, the blue light is reduced to 15%.

[0129] Of course, the above proportion of the preset value range and the chromaticity adjustment value is only an example, which can be set differently according to the need; and the above is only for the above (255, 128, 32) pixel value to be targeted, in order to cover more pixel value, the proportion of the preset value range can be set more.

[0130] In an embodiment, due to the reduction of the chromaticity of the part of the light, the luminance of A point is reduced, for this, the corresponding transmittance T AG and T AG , can make LA unchanged:

[0131] That is, when the green light is reduced to 50% and the blue light is reduced to 12.5%, the transmittance can be increased to compensate the pixel value of A point in the backlight to (255, 255, 255), so that the same color can be displayed on the panel, but the power consumption of 50% green light and 87.5% blue light is saved, and the energy is saved.

[0132] In an embodiment, on the basis of the chromaticity adjustment, the luminance is also adjusted, and the mixed adjustment of the chromaticity and the luminance is realized. For the partition corresponding to the display area which is relatively bright, the luminance of the light emitting unit can be increased, and for the partition 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 partition is consistent with the display panel, and the contrast of the image display is improved.

[0133] When the T of the multiple light emitting colors of the light emitting unit changes in different proportions, for example, when T Bn , T Gn , T Rn changes in different proportions, the luminance and chromaticity of the light emitting unit of the partition are adjusted.

[0134] In one embodiment, a multi-color light emitting system driving apparatus is also provided, the light emitting system comprising a plurality of light emitting units, each of the light emitting units comprising a plurality of light emitting elements, the light emitting elements of each of the light emitting units having different light emitting colors. Referring to FIG. 11, the multi-color light emitting system driving apparatus comprises:

[0135] a wavelength centralization adjustment module 11 for respectively adjusting the wavelengths of the light emitting elements of each of the light emitting colors to be consistent;

[0136] a light emitting brightness uniformization adjustment module 12 for respectively adjusting the light emitting brightness of the light emitting elements of each of the light emitting colors to be consistent;

[0137] a color mixing module 13 for mixing the light emitting colors in the light emitting units according to the required component ratio of the target color temperature.

[0138] In one embodiment, the wavelength centralization adjustment module specifically comprises:

[0139] an initial driving current providing module for providing an initial driving current to the light emitting elements;

[0140] a current fine tuning module for measuring the wavelength of each of the light emitting elements, and adjusting the initial driving current corresponding to the light emitting element when the wavelength of the light emitting element is inconsistent with the preset wavelength, so that the wavelength of the light emitting element is consistent with the preset wavelength.

[0141] In one embodiment, the multi-color light emitting system driving apparatus further comprises:

[0142] a partition dimming module for dividing the light emitting system into a plurality of partitions, and respectively dimming the light emitting units in the plurality of partitions.

[0143] In one embodiment, the partition dimming module is specifically for adjusting the brightness of the light emitting units in the plurality of partitions.

[0144] In one embodiment, the partition dimming module is specifically for adjusting the chromaticity of the light emitting units in the plurality of partitions.

[0145] In one embodiment, an electronic device is provided, please refer to Fig. 12. At the 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 the business. One or more embodiments of the present application can be implemented in software, such as by the processor 21 reading corresponding computer programs from the storage 25 to the memory 24 and then running. Of course, in addition to the software implementation, one or more embodiments of the present application do not exclude other implementations, such as logic devices or a combination of software and hardware, and so on, that is, the execution subject of the following processing flow is not limited to each logical unit, but also can be hardware or logic device.

[0146] 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.

[0147] In a typical configuration, a computer includes one or more processors (CPUs), input / output interfaces, network interfaces and memories.

[0148] The memory can include non-permanent memory in a 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 a computer readable medium.

[0149] The computer readable medium includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The 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 technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, disk storage, quantum memory, graphene-based storage medium or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition in this paper, computer readable medium does not include transitory computer readable medium, such as modulated data signals and carriers.

[0150] The above described a particular embodiment of the present application. Other embodiments are within the scope of the following claims. In some cases, the acts or steps recited in the claims can be performed in a different order and still accomplish the desired results. Also, the order or sequence of those processes depicted in the diagrams do not necessarily have to be adhered to. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0151] 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 conjunction 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.

[0152] 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 it; 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 driving method for a multicolor light-emitting system, characterized in that, The multi-color light-emitting system includes multiple sets of light-emitting units, each set of light-emitting units includes multiple light-emitting elements, and the multiple light-emitting elements in each set of light-emitting units emit different colors. The driving method includes: The wavelengths of multiple light-emitting elements for each light-emitting color are adjusted in a centralized manner to make the wavelengths of the multiple light-emitting elements for each light-emitting color tend to be consistent. The luminance of multiple light-emitting elements of each luminous color is adjusted to make the luminance of multiple light-emitting elements of each luminous color tend to be consistent. The various light-emitting colors in the light-emitting unit are mixed according to the component ratio required for the target color temperature.

2. The multicolor light-emitting system driving method according to claim 1, characterized in that, The process of centrally adjusting the wavelengths of multiple light-emitting elements for each emitting color specifically includes: An initial drive current is provided to the plurality of said light-emitting elements; The wavelength of each light-emitting element is measured, and when it is inconsistent with the preset wavelength, the corresponding initial driving current is adjusted so that its wavelength tends to be consistent with the preset wavelength.

3. The multicolor light-emitting system driving method according to claim 2, characterized in that, When its wavelength is inconsistent with the preset wavelength, the corresponding initial driving current is adjusted so that its wavelength tends to be consistent with the preset wavelength, specifically including: When it is inconsistent with the preset wavelength, the corresponding initial drive current is adjusted in a stepwise fine-tuning manner until its wavelength tends to be consistent with the preset wavelength.

4. The driving method for a multicolor light-emitting system according to any one of claims 1 to 3, characterized in that, The brightness of multiple light-emitting elements for each color of light is adjusted centrally, specifically including: The duty cycle of the light-emitting element is adjusted to bring its brightness into line with the target brightness.

5. The multicolor light-emitting system driving method according to claim 4, characterized in that, Adjusting the duty cycle of the light-emitting element to bring its brightness closer to the target brightness includes: The duty cycle of the light-emitting element is adjusted by successive fine-tuning until the brightness of the light-emitting element is adjusted to be consistent with the target brightness.

6. The driving method for a multicolor light-emitting system according to claim 1, characterized in that, After the multiple light-emitting colors in the light-emitting unit are mixed according to the component ratio required for the target color temperature, it also includes: The light-emitting system is divided into multiple zones, and the light-emitting units in each zone are individually tuned and dimmed.

7. A driving device for a multi-color light-emitting system, characterized in that, The light-emitting system includes multiple sets of light-emitting units, each set of light-emitting units includes multiple light-emitting elements, and the multiple light-emitting elements in each set of light-emitting units emit different colors. The driving device includes: The wavelength centralization adjustment module is used to centrally adjust the wavelengths of multiple light-emitting elements of each emission color to make their wavelengths more consistent. The brightness uniformity adjustment module is used to uniformly adjust the brightness of multiple light-emitting elements of each light-emitting color, so that their brightness tends to be uniform. The color mixing module is used to mix multiple luminescent colors in the light-emitting unit according to the component ratio required for the target color temperature.

8. A backlight system, characterized in that, include: A multi-color light-emitting system and a multi-color light-emitting system driving device, wherein the multi-color light-emitting system driving device is used to drive the multi-color light-emitting system; The multicolor light-emitting driving device is the multicolor light-emitting system driving device as described in claim 7.

9. An electronic device, characterized in that, include: processor; And, memory used to store processor-executable instructions; The processor implements the steps of the method according to any one of claims 1-6 by running the executable instructions.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-6.

Images