CN113409738A - Backlight source circuit, control method thereof and display device - Google Patents
Backlight source circuit, control method thereof and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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Abstract
The application discloses backlight source circuit and control method, display device thereof includes: the driving module is provided with at least one driving circuit, each driving circuit is respectively connected with the backlight sources connected in series on one branch circuit, and the driving module drives the backlight sources on the corresponding branch circuit by using driving signals; the control module determines a driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight source connected with each driving circuit; the light-emitting module comprises backlight sources connected in series on at least one branch, each backlight source adopts a continuous spectrum, the spectrum of the backlight source on the same branch is the same, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color cast with the highest wavelength energy in different color cast systems in the spectrum. The method overcomes the defect that the sub-pixel adjusting method cannot change the color temperature value of the highest-level gray scale, and the backlight sources with different spectrums emit light simultaneously to form a full-spectrum light source similar to sunlight, so that the best light source adapting effect is achieved for human eyes.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a backlight source circuit, a control method thereof and display equipment.
Background
At present, the liquid crystal display adopts an led (light Emitting diode) lamp with unique spectrum and the same light Emitting characteristic as a backlight source, once the led (light Emitting diode) is selected, the color temperature of the white light of the liquid crystal display becomes fixed and non-adjustable, and in different application scenes, the color temperature of the intermediate gray scale can be adjusted only through RGB (Red, Green, Blue) sub-pixels of the liquid crystal panel, and the white field gray scale under the highest gray scale cannot be changed, so that the white balance of the image is inconsistent, and the display effect is affected. For example: the medical diagnosis display has the main application scene of watching various radiographic images communicated by monochrome, black and white gray scales, and the corresponding liquid crystal screens comprise a color screen and a gray scale screen. Although the color screen can combine the color temperatures of the intermediate gray scales of each level through different luminous intensities of the RGB (Red, Green and Blue) sub-pixels, for the color temperature of the highest gray scale, the luminous intensities of the RGB (Red, Green and Blue) sub-pixels reach the maximum value and no adjusting space is provided, so the color temperature of the highest gray scale is completely limited by the color temperature of the light source of the backlight of the liquid crystal screen. For a monochrome gray-scale liquid crystal screen, because there is no RGB (Red, Green, Blue) sub-pixel, the color temperature of each level of gray scale is completely dependent on the spectrum and color temperature of the backlight of the liquid crystal screen, and the color temperature adjustment during the trial process cannot be realized.
Disclosure of Invention
The application aims to provide a backlight source circuit, a control method of the backlight source circuit and a display device. The liquid crystal display screen is used for solving the problems that the white color temperature of the existing liquid crystal display screen is fixed and unadjustable, and the white field gray scale under the highest gray scale can not be changed, so that the white balance of the image is inconsistent.
In a first aspect, an embodiment of the present application provides a backlight circuit, where the circuit includes:
the device comprises a control module, a driving module and a light emitting module;
the driving module comprises at least one driving circuit, each driving circuit is respectively connected with the backlight sources connected in series on one branch circuit, and the driving circuit drives the backlight sources on the corresponding branch circuit by using driving signals;
the control module determines a driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight source connected with each driving circuit;
the light-emitting module comprises backlight sources connected in series on at least one branch, each backlight source adopts continuous spectrum, the spectrum of the backlight source on the same branch is the same, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color cast with the highest wavelength energy in different color cast systems in the spectrum.
In some possible embodiments, the light emitting module includes a plurality of lamp regions, each of the lamp regions including a backlight source respectively connected to each of the at least one driving circuit.
In some possible embodiments, the control module is specifically configured to determine the light emission intensities of the backlight sources on different branches according to the spectrums of the backlight sources connected to the driving circuits and the target color temperatures, and determine the intensities of the driving signals corresponding to the driving circuits according to the determined light emission intensities.
In some possible embodiments, the control module is specifically configured to determine a PWM modulation waveform corresponding to each driving circuit according to the determined light emission intensity, and input the PWM modulation waveform to each driving circuit;
the driving circuit is specifically used for converting the input PWM waveform into a constant current driving source of the backlight source and outputting driving current to drive the backlight source on the corresponding branch.
In some possible embodiments, the control module is specifically configured to adjust the light emission coefficients corresponding to the backlight sources on different branches according to a target color temperature, so that the energies of the backlight sources on the branches with different color system wavelengths are multiplied by the corresponding light emission coefficients, and the energies of the synthesized spectra with different color system wavelengths obtained after the spectrum synthesis correspond to the target color temperature; and determining the luminous intensity of the backlight sources on different branches according to the luminous coefficients corresponding to the backlight sources on different branches.
In some possible embodiments, the backlight includes: at least one of LED light source, CCFL light source, and EL light source.
In a second aspect, an embodiment of the present application provides a display device, including a display panel for displaying pixel data; the backlight circuit is used for providing a backlight for the display panel.
In a third aspect, an embodiment of the present application provides a backlight circuit control method, including:
determining a driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight connected with each driving circuit in the backlight circuit;
sending the driving signals to corresponding driving circuits so that the driving circuits drive the backlight sources connected in series on the corresponding branches by using the corresponding driving signals;
the backlight sources on the same branch have the same spectrum, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color system with the highest wavelength energy in different color systems in the spectrum.
In some possible embodiments, determining the driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight source connected to each driving circuit in the backlight source circuit includes:
determining the luminous intensity of the backlight sources on different branches according to the spectrum and the target color temperature of the backlight source connected with each driving circuit;
and determining the intensity of the driving signal corresponding to each driving circuit according to the determined luminous intensity.
In some possible embodiments, determining the light emission intensity of the backlight sources on different branches according to the spectrum of the backlight source connected to each driving circuit and the target color temperature includes:
adjusting the corresponding light-emitting coefficients of the backlight sources on different branches according to the target color temperature so as to multiply the energy of the backlight sources on each branch with different color system wavelengths by the corresponding light-emitting coefficients, and performing spectrum synthesis to obtain energy of different color system wavelengths of a synthesized spectrum corresponding to the target color temperature;
and determining the luminous intensity of the backlight sources on different branches according to the luminous coefficients corresponding to the backlight sources on different branches.
According to the embodiment of the application, different relatively continuous backlight sources with color cast systems are integrated on each branch of the driving circuit, so that the continuous spectrum light source output of the liquid crystal screen backlight system without the color cast systems is realized; the change of the color temperature of the backlight source is realized by controlling the brightness of the backlight source with different continuous spectrums of color cast systems. Compared with the current method for adjusting the color temperature of the image through the RGB sub-pixels of the liquid crystal panel, the method can make up the defect that the sub-pixel adjusting method cannot change the color temperature value of the highest-level gray scale, and simultaneously, the backlight sources with different spectrums emit light simultaneously to form a full-spectrum light source similar to sunlight, so that the best light source adapting effect is generated for human eyes.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of backlight circuitry according to one embodiment of the present application;
FIG. 2 is a diagram of a backlight circuit according to one embodiment of the present application;
FIG. 3 is a circuit diagram of a lamp area formed by three backlights according to an embodiment of the present application;
FIG. 4 is a schematic view of a display device according to one embodiment of the present application;
FIG. 5 is a flowchart illustrating the control of a backlight circuit according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a spectral synthesis according to one embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the accompanying drawings. In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" in the text is only an association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: three cases of a alone, a and B both, and B alone exist, and in addition, "a plurality" means two or more than two in the description of the embodiments of the present application.
In the description of the embodiments of the present application, the term "plurality" means two or more unless otherwise specified, and other terms and the like should be understood similarly, and the preferred embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not intended to limit the present application, and features in the embodiments and examples of the present application may be combined with each other without conflict.
To further illustrate the technical solutions provided by the embodiments of the present application, the following detailed description is made with reference to the accompanying drawings and the detailed description. Although the embodiments of the present application provide method steps as shown in the following embodiments or figures, more or fewer steps may be included in the method based on conventional or non-inventive efforts. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application. The method can be executed in the order of the embodiments or the method shown in the drawings or in parallel in the actual process or the control device.
In view of the fact that the backlight sources adopted by the liquid crystal display in the related art are identical in spectral distribution and have the same light-emitting characteristic, once the LEDs are selected, the color temperature of the white light of the liquid crystal display is fixed and cannot be adjusted, the color temperature of the intermediate gray scale can only be adjusted through the RGB sub-pixels of the liquid crystal panel under different application scenes, and the white field gray scale under the highest gray scale cannot be changed, so that the white balance of the image is inconsistent, and the display effect is affected. The application provides a backlight source circuit, a control method thereof and a display device, which can realize continuous spectrum light source output of a liquid crystal screen backlight system; the change of the color temperature of the backlight light source is realized by controlling the brightness of the LED lamp with continuous spectrums of different color cast systems.
In view of the above, the inventive concept of the present application is: when the backlight source normally works, each light emitting area is a light mixing unit, LED lamps with different spectrums are subjected to light intensity adjustment, light mixing is carried out to generate a backlight light source which is continuous in spectrum and has no color cast and has a new color coordinate point, different backlight sources originally having respective color cast systems are combined into an LED spectrum which has no color cast in the mode, and a light source which is approximate to a continuous natural light spectrum and has a spectrum close to a continuous spectrum is generated through mixing of a plurality of LED lamps with different spectrums, so that the spectrum, the color temperature and the color coordinate point of the backlight light source are changed.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Embodiments of the present disclosure relate generally to the problem of color shift caused by relatively continuous color system of the color temperature and the spectrum of the backlight, where the conventional spectrum is discontinuous. The natural light is continuous, the visual effect is good, and the human eyes receive the natural light to accord with the physiological characteristics. At present, the backlight source adopts a unique spectrum, and all the spectra have the same light-emitting characteristics, for example, when white light is displayed, energy is respectively provided for blue, green and red to form a white light effect, and a lamp of the backlight source is white light formed by red, green and blue light-emitting materials. When white light passes through the RGB of the liquid crystal panel, a color effect is formed. The backlight source has better effect on the gray-scale screen, the gray-scale screen has no RGB, and the layer of the color filter film is absent, so that the backlight displays light, the brightness is controlled in front, the components of the light are not controlled, and the components of the light are not controlled. The problems that arise with prior art display devices are: the existing backlight lamp for displaying white light is composed of lamps with three colors, the spectrums are independent, all the backlight lamps need to be adjusted to be consistent in order to display the white light, the independent operation cannot be realized, the color cast phenomenon can occur when the independent operation or the adjustment is not consistent, the color temperature is related to the spectrums, the backlight lamp emits light when the heat is generated to a certain degree, the color is blue when the temperature is extremely high, the spectrums are also parameters for expressing the light emitting color cast, the color temperature of each level of middle gray scale can be combined through different light emitting intensities of RGB sub-pixels in the existing color screen, but for the color temperature of the highest level gray scale, the color temperature of the highest level gray scale is completely limited by the color temperature of a light source of the backlight of the liquid crystal screen because the light emitting intensities of the RGB sub-pixels reach the maximum value and no adjustment space is available. For the monochrome gray-scale liquid crystal screen, because the RGB sub-pixels are not arranged, the color temperature of each gray scale completely depends on the backlight spectrum and the color temperature of the liquid crystal screen, and the color temperature adjustment in the trial process cannot be realized. In the present application, improvements are made in the adjustment of the spectrum and color temperature of the backlight, and the basic circuit structure diagram is shown in fig. 1.
The backlight circuit in the embodiment of the present application is described in detail below with reference to the drawings.
Referring to fig. 1, a system block diagram of a backlight circuit according to an embodiment of the present application is shown.
As shown in fig. 1, the basic circuit structure diagram includes a control module, a driving module and a light emitting module, the control module sends a driving signal to the driving module, and the driving module drives the light emitting module to emit light according to the received driving signal.
Specifically, the control module adjusts and distributes the luminous intensity of different types of backlights according to the target color temperature of the backlight required to be achieved and the parameters of backlight lamps of a plurality of different color coordinate points on a plurality of branches driven by different driving modules, outputs a responding PWM modulation waveform, and realizes the change of the luminous intensity of the backlight through the adjustment of the duty ratio. The driving module provides current drive meeting requirements for lighting of the backlight source, and converts the PWM waveform output by the backlight source control module into a constant current driving source for driving the backlight source. The backlight light-emitting module is driven by the driving module.
Fig. 2 shows a circuit structure diagram of a backlight according to an embodiment of the present application, which includes: a control module 10, a driving module 20 and a light emitting module 30, wherein:
the driving module 20 includes at least one driving circuit 201, each driving circuit is connected to the backlight 301 connected in series on one branch, and drives the backlight on the corresponding branch by using a driving signal;
each branch is connected with a plurality of backlight sources in series, and the number of the backlight sources connected with different branches in series can be the same or different.
The backlight source on one branch circuit is driven by the driving circuit, so that the backlight sources on the branch circuit are simultaneously opened or closed, and the same driving signal is adopted for driving when the backlight sources are opened.
The control module 10 determines a driving signal of each driving circuit according to the spectrum of the backlight source connected with each driving circuit and the target color temperature;
the target color temperature is energy with different wavelengths corresponding to the synthesized spectrums of the multiple backlight sources, and the intensity of the driving signal can control energy with different color system wavelengths of the spectrums of the various backlight sources.
The light-emitting module comprises backlight sources connected in series on at least one branch, each backlight source adopts continuous spectrum, the spectrum of the backlight source on the same branch is the same, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color cast with the highest wavelength energy in different color cast systems in the spectrum.
According to the embodiment of the application, different relatively continuous backlight sources with color cast systems are integrated on each branch of the driving circuit, so that the continuous spectrum light source output of the liquid crystal screen backlight system without the color cast systems is realized; the change of the color temperature of the backlight source is realized by controlling the brightness of the backlight source with different relatively continuous spectrums with color cast systems. Compared with the current method for adjusting the color temperature of the image through the RGB sub-pixels of the liquid crystal panel, the method can make up the defect that the sub-pixel adjusting method cannot change the color temperature value of the highest-level gray scale, and simultaneously, the backlight sources with different spectrums emit light simultaneously to form a full-spectrum light source similar to sunlight, so that the best light source adapting effect is generated for human eyes.
Optionally, the light emitting module includes a plurality of lamp zones, and each lamp zone includes a backlight source respectively connected to each driving circuit of the at least one driving circuit.
Specifically, fig. 3 illustrates three driving circuits, three backlights respectively connected to the three driving circuits are provided for each lamp region, and the three backlights in each lamp region have different spectral characteristics, so that the color coordinate point and the color temperature of each backlight are different from each other. Three backlights are arranged in a concentrated manner to form a light-emitting area, and the three backlights of each light-emitting area are independently driven by the driving circuit in the driving unit. The n light emitting areas are arranged on one light bar, the light bar is composed of a plurality of branches, and the backlight sources with the same spectrum and color coordinate points in each light emitting area are connected to the driving circuit of the same branch in a series mode, so that the backlight sources with the same spectrum and color coordinate points in different light emitting areas have the same luminous intensity when emitting light. When each backlight source is independently lightened or combined lightened, the backlight of the liquid crystal display screen is uniform and consistent in light emission.
Optionally, the control module is specifically configured to determine intensities of the backlight sources on different branches according to the spectrums of the backlight sources connected to the driving circuits and the target color temperatures, and determine the intensity of the driving signal corresponding to each driving circuit according to the determined light emission intensity.
Specifically, the control module adjusts and distributes the luminous intensities of different types of backlights according to the target color temperature required to be achieved and the parameters of the backlights with different color coordinate points on the branches, for example, the backlights on the three branches are RGB, and the luminous intensity of the first branch is slightly stronger than that of the blue (B); the light emitting intensity of the second branch circuit is lower than that of the first branch circuit, and the light emitting intensity of the second branch circuit is higher than that of the first branch circuit; the third branch circuit is low in blue light wave bias, low in green light wave bias and high in red light wave (R) luminous intensity relative to the blue light waves of the first branch circuit and the second branch circuit, when the control module determines driving signals corresponding to the driving circuits, the control module needs to weaken the B driving signal intensity in the first branch circuit, weaken the G driving signal intensity in the second branch circuit, weaken the R driving signal in the third branch circuit, and finally complete spectrum synthesis, so that the spectrum in a relatively ideal state is in a flat state, and no infrared part exists.
Optionally, the control module is specifically configured to determine a PWM modulation waveform corresponding to each driving circuit according to the determined light emission intensity, and input the PWM modulation waveform to each driving circuit;
the driving circuit is specifically used for converting the input PWM waveform into a constant current driving source of the backlight source and outputting driving current to drive the backlight source on the corresponding branch.
Specifically, the control unit adjusts and distributes the luminous intensity of different backlights according to the target color temperature required to be achieved and the parameters of the backlights with different color coordinate points on the light bar, so that the target color temperature light source is adjusted and realized, a response PWM modulation waveform is output, and the luminous intensity of the backlights is adjusted through the duty ratio. When the duty ratio is on, the current is fixedly electrified, and when the duty ratio is off, the current is cut off. The backlight source on each branch circuit is controlled by the power-on or not of the backlight source and the proportion of the power-on current, the backlight source on each branch circuit flickers on a switch, the backlight sources on the three branch circuits have different phases, and the integral effect on time and space is felt by the light due to the hysteresis of human eyes and the average effect of the human eyes. And when the target color temperature is determined, the driving current of each light bar is adjusted, and the color temperature corresponding to the synthesized spectrum of the three light bars is matched with the target color temperature. The backlight sources on the three branches have the same duty ratio, all the backlight sources are bright and dark together under the control of current, no intersection exists, spectrums with equal duration are mixed, the duty ratios are converted into current values, and the time ratio of charging and power-off is obtained. When the backlight source works normally, each light emitting area is a light mixing unit, after the backlight sources with different spectrums are adjusted in light emitting intensity, the mixed light generates the backlight sources with continuous spectrums and new color coordinate points, and the light sources with the spectrums close to continuous spectrums and similar to natural light spectrums are generated, so that the spectrum, the color temperature and the color coordinate points of the backlight light source are changed.
Optionally, the backlight comprises: at least one of LED light source, CCFL light source, and EL light source.
An embodiment of the present application further provides a display device, as shown in fig. 4, the display device includes a display panel for displaying pixel data; the backlight source circuit is used for providing backlight source for the display panel.
Specifically, the backlight source of the liquid crystal screen of the display device forms uniform surface light on the back, the brightness of any one square meter is consistent, various optical films and liquid crystal layers are added on the surface light source, each pixel has a frame to frame the liquid crystal, the liquid crystal in the frame is controlled by supplying power, the liquid crystal display screen is equivalent to a common switch of a window, the size of the light transmission quantity is controlled by the switch, the light transmitted from the surface light source to the front controls each pixel point by the pixel, and the gray-scale screen is also based on the same principle.
An embodiment of the present application further provides a backlight control method, as shown in fig. 5, the method includes:
the backlight sources on the same branch have the same spectrum, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color system with the highest wavelength energy in different color systems in the spectrum.
Specifically, the backlights of the present application are all white light lamps, and the distribution of the spectrum of each backlight over the different stripe branches is a heavily emphasized but relatively continuous spectrum. The backlight sources on different branches deflect to different color temperatures respectively, and the lateral emphasis points of deflected spectrums are different.
Optionally, determining a driving signal of each driving circuit according to a spectrum of a backlight connected to each driving circuit in the backlight circuit and the target color temperature includes:
determining the luminous intensity of the backlight sources on different branches according to the spectrum and the target color temperature of the backlight source connected with each driving circuit;
and determining the intensity of the driving signal corresponding to each driving circuit according to the determined luminous intensity:
specifically, referring to the spectrum synthesis diagram shown in fig. 6, the backlight sources on the three branches from left to right are respectively that the first branch is higher than the blue light wave and bulges like a mountain, the green light wave is gentle, and the red light wave is lower and is sunken like a gully; the second branch has lower blue light wave and higher green light wave relative to the blue light wave of the first branch, and the second branch has a mountain-peak shape bulge, and the red light wave is higher relative to the red light wave of the first branch; the third branch has lower blue light wave relative to the blue light wave of the first branch and the second branch, the green light wave is in a gentle state, the red light wave is high and swells in a mountain peak shape, and the color temperature of the first branch is 8000k when the first branch works independently, and the color temperature is blue; the independent working color temperature of the second branch is 6000k and is positioned between the color temperatures of the first branch and the second branch; the independent working color temperature of the third branch is 5000k, the presented color temperature is reddish, in actual control, three branches can be controlled to reach a target color temperature value in a combined mode, and also two branches can be controlled to reach the target color temperature in a combined mode, for example, the most comfortable color temperature of human eyes is 6500k, when the combined color temperature of the lamps on the three branches falls within the range of 6500k, the synthesis of the spectrum is completed, the spectrum presents a smooth state in a relatively ideal state, and no infrared part exists.
As an optional implementation manner, the case that the three backlights form one lamp area may further include that the light waves of the first branch backlight which are more blue and more green are higher, and bulge like a peak, and the light waves which are more red are in a gentle state; the light waves of the second branch backlight source which are bluish and greenish are relatively smooth, the reddish light waves are relatively high, and the second branch backlight source is bulged in a mountain peak shape; the RGB of the third branch backlight source is in a relatively flat and slow state, and the smooth continuous spectrum can be achieved by only adjusting the first branch backlight source and the second branch backlight source and combining the first branch backlight source and the second branch backlight source, so that the spectrum synthesis is completed.
Optionally, determining the light emission intensity of the backlight sources on different branches according to the spectrum of the backlight source connected to each driving circuit and the target color temperature includes:
and adjusting the light-emitting coefficients corresponding to the backlight sources on different branches according to the target color temperature so as to multiply the energy of the backlight sources on each branch with the corresponding light-emitting coefficient, and performing spectrum synthesis to obtain a synthesized spectrum with the energy of different color system wavelengths corresponding to the target color temperature.
And determining the luminous intensity of the backlight sources on different branches according to the luminous coefficients corresponding to the backlight sources on different branches.
Specifically, since the adjustment range of the spectrum is affected by the intensity of the driving signal, taking an example that three backlights form a lamp area, the backlights on the three branches are respectively, the energy corresponding to the blue-biased wavelength of the first branch is a, the energy corresponding to the green-biased wavelength is b, the energy corresponding to the red-biased wavelength is c, the light-emitting coefficient of the first branch is x, and the color temperatures of the first branch with different color system wavelengths are: ax + bx + cx; the energy corresponding to the blue-biased wavelength of the second branch is a2, the energy corresponding to the green-biased wavelength is b2, the energy corresponding to the red-biased wavelength is c2, the luminous coefficient of the first branch is y, and the color temperature of the second branch with different color system wavelengths is: a2y + b2y + c2 y; the energy corresponding to the blue-biased wavelength of the third branch is a3, the energy corresponding to the green-biased wavelength is b3, the energy corresponding to the red-biased wavelength is c3, the luminous coefficient of the third branch is z, and the color temperature of the third branch with different color system wavelengths is: a3z + b3z + c3z, and by adjusting x \ y \ z and three light-emitting coefficients, the total energy of the spectrum synthesized by the three branches, namely 'ax + bx + cx + a2y + b2y + c2y + a3z + b3z + c3 z', meets the target color temperature in sum, namely, the synthesis of the spectrum is completed, and the spectrum in a relatively ideal state is in a smooth state.
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A backlight circuit, comprising: the device comprises a control module, a driving module and a light emitting module;
the driving module comprises at least one driving circuit, each driving circuit is respectively connected with the backlight sources connected in series on one branch circuit, and the driving circuit drives the backlight sources on the corresponding branch circuit by using driving signals;
the control module determines a driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight source connected with each driving circuit;
the light-emitting module comprises backlight sources connected in series on at least one branch, each backlight source adopts continuous spectrum, the spectrum of the backlight source on the same branch is the same, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color cast with the highest wavelength energy in different color cast systems in the spectrum.
2. The backlight circuit according to claim 1,
the light emitting module comprises a plurality of lamp areas, and each lamp area comprises a backlight source which is respectively connected with each driving circuit in the at least one driving circuit.
3. The backlight circuit according to claim 1 or 2, wherein the control module is specifically configured to determine the light emission intensities of the backlights on different branches according to the spectrums of the backlights connected to the driving circuits and the target color temperatures, and determine the intensities of the driving signals corresponding to the driving circuits according to the determined light emission intensities.
4. The backlight circuit according to claim 3, wherein the control module is specifically configured to determine a PWM modulation waveform corresponding to each driving circuit according to the determined light emission intensity, and input the PWM modulation waveform to each driving circuit;
the driving circuit is specifically used for converting the input PWM waveform into a constant current driving source of the backlight source and outputting driving current to drive the backlight source on the corresponding branch.
5. The backlight circuit according to claim 3, wherein the control module is specifically configured to adjust the light emission coefficients corresponding to the backlights in different branches according to a target color temperature, so that the energies of the backlights in different color system wavelengths in each branch are multiplied by the corresponding light emission coefficients, and the energies of the synthesized spectra in different color system wavelengths obtained after the spectral synthesis correspond to the target color temperature; and determining the luminous intensity of the backlight sources on different branches according to the luminous coefficients corresponding to the backlight sources on different branches.
6. The backlight circuit according to claim 1 or 2, wherein the backlight comprises: at least one of LED light source, CCFL light source, and EL light source.
7. A display device, characterized in that the display device comprises:
a display panel for displaying pixel data;
the backlight circuit according to any one of claims 1 to 5, for providing a backlight to the display panel.
8. A backlight source circuit control method is characterized by comprising the following steps:
determining a driving signal of each driving circuit according to the spectrum and the target color temperature of the backlight connected with each driving circuit in the backlight circuit;
sending the driving signals to corresponding driving circuits so that the driving circuits drive the backlight sources connected in series on the corresponding branches by using the corresponding driving signals;
the backlight sources on the same branch have the same spectrum, the spectrum of the backlight sources on different branches is different and corresponds to different color cast systems, and the color cast system is the color system with the highest wavelength energy in different color systems in the spectrum.
9. The method of claim 8, wherein determining the driving signal for each driving circuit according to the spectrum of the backlight source connected to each driving circuit in the backlight source circuit and the target color temperature comprises:
determining the luminous intensity of the backlight sources on different branches according to the spectrum and the target color temperature of the backlight source connected with each driving circuit;
and determining the intensity of the driving signal corresponding to each driving circuit according to the determined luminous intensity.
10. The method of claim 8, wherein determining the luminous intensity of the backlight sources on different branches according to the spectrum and the target color temperature of the backlight source connected to each driving circuit comprises:
adjusting the corresponding light-emitting coefficients of the backlight sources on different branches according to the target color temperature so as to multiply the energy of the backlight sources on each branch with different color system wavelengths by the corresponding light-emitting coefficients, and performing spectrum synthesis to obtain energy of different color system wavelengths of a synthesized spectrum corresponding to the target color temperature;
and determining the luminous intensity of the backlight sources on different branches according to the luminous coefficients corresponding to the backlight sources on different branches.
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