CN116013206A - Backlight control method, control circuit, backlight source and display device - Google Patents
Backlight control method, control circuit, backlight source and display device Download PDFInfo
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Abstract
The invention discloses a backlight control method, a control circuit, a backlight source and a display device, wherein the method comprises the following steps: acquiring a backlight control signal; and adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion. Therefore, the inhibition degree of the display light on melatonin secretion can be regulated, the display device with the rhythm regulating function is realized, and the healthy display function of the display device is enriched.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight control method, a control circuit, a backlight source, and a display device.
Background
With the development of electronic technology, electronic display is widely applied to various industries and various scenes, and the requirements on display devices are also increasing. Healthy displays such as low blue displays are an important direction of display device development. At present, the health display function of the display device is single, and the display device is mainly embodied in the aspect of eye protection, so that the health display function of the display device needs to be further enriched in order to ensure the health use of the display device by a user.
Disclosure of Invention
The invention provides a backlight control method, a control circuit, a backlight source and a display device.
In a first aspect, an embodiment of the present invention provides a backlight control method, including: acquiring a backlight control signal; and adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
Further, the backlight source comprises a first blue light chip with a light-emitting wave band filtering the rhythm blue light wave band and a second blue light chip with the light-emitting wave band covering the rhythm blue light wave band. The adjusting the duty ratio of the rhythmic blue light wave band in the light emitted by the backlight source according to the backlight control signal comprises the following steps: obtaining a first control signal and a second control signal according to the backlight control signal; and controlling the light emitting proportion of the first blue light chip according to the first control signal, and controlling the light emitting proportion of the second blue light chip through the second control signal.
Further, the backlight control signal includes: backlight brightness control signals and rhythm control signals. The backlight brightness control signal is used for controlling the overall brightness of the backlight, and the rhythm control signal is used for controlling the light emitting proportion of the first blue light chip. The obtaining a first control signal and a second control signal according to the backlight control signal includes: and generating the first control signal and the second control signal according to the backlight brightness control signal and the rhythm control signal.
Further, the acquiring the backlight control signal includes:
acquiring the backlight brightness control signal and a time signal from a display interface;
determining display time according to the time signal;
searching the light emitting proportion of the first blue light chip corresponding to the belonged time period in a preset rhythm corresponding table according to the display time, wherein the corresponding relation between the time period and the light emitting proportion of the first blue light chip is stored in the rhythm corresponding table;
and generating the rhythm control signal according to the light emitting proportion of the first blue light chip.
Further, the acquiring the backlight control signal includes: the backlight brightness control signal is obtained from a display interface and is determined according to the brightness of the external environment; and obtaining the rhythm control signal according to the backlight brightness control signal.
Further, the acquiring the backlight control signal includes: and acquiring the backlight brightness control signal and the rhythm control signal from a display interface, wherein the rhythm control signal is generated according to a target proportion corresponding to a preset trigger operation executed by a user.
Further, the generating the first control signal and the second control signal according to the backlight brightness control signal and the rhythm control signal includes:
performing inverse processing on the rhythm control signal to obtain a non-rhythm control signal;
multiplying the backlight brightness control signal and the rhythm control signal to obtain the first control signal;
and multiplying the backlight brightness control signal and the non-rhythm control signal to obtain the second control signal.
Further, the backlight source comprises a first blue light chip with a light-emitting wave band filtering the rhythm blue light wave band and a second blue light chip with the light-emitting wave band covering the rhythm blue light wave band. The backlight control signal comprises a backlight brightness control signal and an enabling signal, and the backlight brightness control signal is used for controlling the overall brightness of the backlight. The adjusting the duty ratio of the rhythmic blue light wave band in the light emitted by the backlight source according to the backlight control signal comprises the following steps: and controlling the first blue light chip or the second blue light chip to emit light according to the backlight brightness control signal according to the enabling signal.
Further, the rhythmic blue light wave band is: 450 nm-480 nm.
In a second aspect, an embodiment of the present invention provides a backlight control circuit, including: a first sub-circuit for acquiring a backlight control signal; and the second sub-circuit is used for adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
Further, the backlight source comprises a first blue light chip with a light-emitting wave band filtering the rhythm blue light wave band and a second blue light chip with the light-emitting wave band covering the rhythm blue light wave band. The second sub-circuit includes:
the controller is used for obtaining a first control signal and a second control signal according to the acquired backlight control signal;
the first driver is connected with the controller and the first blue light chip and is used for controlling the light emitting proportion of the first blue light chip according to the first control signal;
and the second driver is connected with the controller and the second blue light chip and is used for controlling the light emitting proportion of the second blue light chip according to the second control signal.
Further, the backlight control signal includes: backlight brightness control signals and rhythm control signals. The controller includes:
the inverter is used for inverting the acquired rhythm control signal to obtain a non-rhythm control signal;
the processing unit is connected with the inverter, the first driver and the second driver and is used for multiplying the backlight brightness control signal and the rhythm control signal to obtain the first control signal; and multiplying the backlight brightness control signal and the non-rhythm control signal to obtain the second control signal.
In a third aspect, an embodiment of the present invention provides a backlight, including: the blue light emitting chip with the adjustable luminous duty ratio of the rhythm blue light wave band is used for emitting backlight with different luminous duty ratios of the rhythm blue light wave band under the action of the backlight control method provided by the first aspect, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
Further, the blue light emitting chip includes: the first blue light chip of the rhythm blue light wave band is filtered by the light-emitting wave band, and the second blue light chip of the rhythm blue light wave band is covered by the light-emitting wave band, and the first blue light chip and the second blue light chip are driven by different drivers.
In a fourth aspect, an embodiment of the present invention provides a display device, including the backlight control circuit provided in the second aspect and the backlight provided in the third aspect, where the backlight control circuit is connected to the backlight.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
the backlight control method provided by the embodiment of the invention obtains the backlight control signal; the duty ratio of a rhythm blue light wave band in light emitted by a backlight source is adjusted according to a backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion, so that the inhibition degree of the display light on the melatonin secretion is adjusted, for example, the inhibition degree of the display light on the melatonin secretion can be regulated at night, the sleep-in is facilitated, the inhibition degree of the display light on the melatonin secretion can be regulated at daytime, the wakefulness is facilitated, a display device with a rhythm regulation function is realized, and the healthy display function of the display device is facilitated to be enriched.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of a backlight according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bi-crystal LED string light according to an embodiment of the present invention;
FIG. 3 is a flowchart of a backlight control method according to an embodiment of the invention;
FIG. 4 is a first exemplary flowchart of step S301 in FIG. 3;
FIG. 5 is a second exemplary flowchart of step S301 in FIG. 3;
FIG. 6 is a third exemplary flowchart of step S301 in FIG. 3;
FIG. 7 is a flowchart of a method for controlling backlight in an on/off rhythm mode according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a backlight control circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a display device according to an embodiment of the invention;
fig. 10 is a flowchart of another backlight control method according to an embodiment of the invention.
Detailed Description
It can be understood that light is the most important factor in regulating circadian rhythm of human body, the upper nucleus of the visual intersection in brain is central clock, and is responsible for integrating the sensed external light signals, and then Zhou Chuandi melatonin is outwards from human body, and the amount of melatonin secretion is the key for controlling the sleep or wakefulness of human body.
The IEC/TR 62778-2014 standard proposes the use of the rhythm factor K c Quantifying intensity of rhythmic effects, in particularThe following formula is shown:
wherein K is m 、K' m Maximum spectral luminous efficacy of photopic vision and rhythmic effect respectively, 683, 3616 lm.W -1 The method comprises the steps of carrying out a first treatment on the surface of the P (λ) is the spectral distribution; the rhythm action function C (lambda) is mainly located in a specific rhythm blue light wave band, such as a blue light wave band of 446 nm-477 nm, and the peak value is at 464nm, and the blue light of the wave band can regulate melatonin secretion of the pineal body in the brain. The photopic spectrum light efficiency function V (lambda) is determined by cone-shaped cell characteristics capable of distinguishing colors on retina, and the peak value is at 555nm, which is suitable for 1 cd.m -2 The above brightness level.
Based on this theoretical basis, in order to further enrich the healthy display function of the display device, the inventors thought that the rhythmic effect may be applied in the display device. From the above formula, C (lambda) and K c Positively correlated, V (lambda) with K c Negative correlation, so if it is desired to increase the display rhythmic effect, the ratio of the light intensity in the C (λ) band should be increased and the ratio of the light intensity in the V (λ) band should be decreased in the composite spectrum.
Therefore, a backlight control method is provided, and the effect of controlling the rhythm effect of the display device is achieved by controlling the duty ratio of the rhythm blue light wave band in the backlight. It can be understood that the duty ratio of the rhythmic blue light wave band is different, and the synthetic influence on the melatonin of the human body is different, so that the intensity of the rhythmic effect of the display device can be controlled and regulated. For example, when the display device is used in daytime, the light intensity proportion of the rhythm blue light wave band in the whole backlight can be improved, melatonin secretion is restrained, and the human body is in a more awake working mode; when the display device is used at night, the light intensity proportion of the rhythmic blue light wave band in the whole backlight is reduced, normal melatonin secretion of a human body is ensured, and good sleep quality is obtained; so as to achieve the effect of regulating the circadian rhythm.
Exemplary embodiments of a backlight control method, a control circuit, a backlight source, and a display device provided by the present invention will be described in detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The backlight control method provided by the embodiment of the invention is applied to a display device, and the display device comprises a backlight source with an adjustable luminous duty ratio of a rhythmic blue light wave band. In order to facilitate understanding of the backlight control method, exemplary embodiments of the backlight will be described first. In other embodiments of the present invention, the backlight may also use other embodiments capable of realizing the adjustment of the light emitting duty ratio of the rhythmic blue band, which is not limited herein.
Specifically, the backlight source comprises a blue light emitting chip, and is used for emitting backlights with different luminous duty ratios of rhythmic blue light wave bands under the control of the backlight control method provided by the embodiment of the invention. The rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion, can be determined according to multiple experiments, for example, can be 450-480 nm or 446-477 nm, and has a strong inhibition effect on human melatonin secretion.
In an alternative embodiment, as shown in fig. 1, the backlight 100 may include a first blue chip 101 whose light emission band filters out the rhythm blue band and a second blue chip 102 whose light emission band covers the rhythm blue band, and the first blue chip 101 and the second blue chip 102 are independently controlled by different drivers. For example, the light emission band of the first blue chip 101 may be: on the basis of the light emitting wave band of the second blue light chip 102, the blue light wave band after the rhythmic blue light wave band is filtered. In order to further achieve the eye protection effect, the second blue light chip 102 may be a low blue light chip, so as to reduce the damage of short-wave blue light to human eyes. In this embodiment, a low blue light chip is mainly used as an example for illustration, however, in other embodiments of the present invention, the second blue light chip 102 may be a common blue light chip that does not filter short-wave blue light, which is not limited herein.
For example, the backlight source 100 may employ a bi-crystal LED, where the bi-crystal LED includes the first blue light chip 101 and the second blue light chip 102, that is, two blue light chips of two LEDs respectively emitting blue light with different wavebands in the same LED lamp bead package. Of course, the bimorph LED includes a YAG yellow phosphor 103, a reflector cup 104, and the like in addition to the blue light chip, which will not be described in detail herein.
As shown in fig. 2, the string of lamps may be composed of a plurality of bi-crystal LEDs to provide sufficient backlight brightness. Each of the bi-crystal LEDs in the string of lamps, the first blue chip 101 and the second blue chip 102 are connected to different leads, which are respectively connected to the first driver 201 and the second driver 202 in the backlight control circuit. In this way, the light emission ratio of the first blue light chip 101 and the second blue light chip 102 in the bi-crystal LED, that is, the ratio of the light emission intensities of the two blue light chips in the entire bi-crystal LED, can be controlled by the two LED drivers, respectively.
After understanding exemplary embodiments of the backlight, a backlight control method provided by an embodiment of the present invention is described below.
Referring to fig. 3, a flowchart of a backlight control method according to an embodiment of the invention is shown. The backlight control method is applied to a backlight control circuit in a display device. As shown in fig. 3, the method includes:
step S301, a backlight control signal is obtained;
in step S302, the duty ratio of the rhythm blue light band in the light emitted by the backlight source is adjusted according to the backlight control signal, wherein the rhythm blue light band is a blue light band for suppressing melatonin secretion.
It can be understood that the display device needs the display end to cooperate with the corresponding client to realize the display of the picture, the client inputs the display control signal through the display interface such as eDP (Embedded DisplayPort) interface, and the display end realizes the display of the picture under the action of the display control signal. In step S301, the backlight control signal may be determined from the display control signal sent from the client, so as to obtain the duty ratio of the rhythmic blue light band in the backlight, which is required by the current scene. It should be noted that, the specific embodiment of the backlight control signal may be determined according to the needs of the actual application scenario and the adjustment mode of the rhythmic blue band duty ratio of the backlight 100.
If the backlight 100 includes a first blue chip 101 whose emission band is filtered out of the rhythm blue band and a second blue chip 102 whose emission band covers the rhythm blue band. At this time, the implementation process of the step S302 may include: firstly, according to a backlight control signal, a first control signal and a second control signal are obtained; then, the light emission ratio of the first blue chip 101 is controlled according to the first control signal, and the light emission ratio of the second blue chip 102 is controlled by the second control signal.
It can be understood that, by adjusting the light emitting proportion of the first blue light chip 101 and the second blue light chip 102, the adjustment of the duty ratio of the rhythmic blue light band in the light emitted by the backlight 100 can be achieved, so as to control the intensity of the rhythmic effect of the display device. For example, when the light emitting proportion of the first blue light chip 101 is relatively high and the light emitting proportion of the second blue light chip 102 is relatively low, the occupancy rate of the rhythmic blue light wave band in the light emitted by the backlight source 100 is relatively low, the inhibition effect on the human body to excrete melatonin is weak, and sleep is facilitated; on the contrary, the light emitted by the backlight 100 has a relatively high duty ratio of the rhythmic blue light band, and has a strong effect of suppressing the secretion of melatonin by the human body, thereby helping to keep awake.
For convenience of the following description, the blue light emitted from the first blue light chip 101 is referred to as low-suppressed blue light, and the blue light emitted from the second blue light chip 102 is referred to as low blue light. That is, it is necessary to determine the low suppressed blue light intensity and the duty ratio of the low blue light intensity in the overall backlight intensity according to the backlight control signal.
In an alternative embodiment, a ratio-tunable mode of the light of the law blue may be provided in which the ratio of the low-suppression blue light may be adjusted to other ratios than 100% and 0%, such as to 20%,50% or 80%, etc. At this time, the backlight control signal may include: a backlight brightness control signal and a rhythm control signal, wherein the backlight brightness control signal is used for controlling the overall brightness of the backlight, and the rhythm control signal is used for controlling the light emitting proportion of the first blue light chip 101, that is, the duty ratio of low blue light inhibition in the backlight emitted by the backlight 100.
It is understood that the backlight brightness control signal may be obtained from the display interface, and the display signal input to the display end by the client includes the backlight brightness control signal, so as to control the overall brightness of the backlight. While there are various ways of acquiring the rhythm control signal, the following embodiments will mainly be described below, and other embodiments may be adopted when the backlight control signal acquisition process of step S301 is specifically implemented, and the present invention is not limited thereto.
First, as shown in fig. 4, the step S301 may include: step S401, obtaining a backlight brightness control signal from a display interface; step S402, obtaining a rhythm control signal from the display interface, wherein the rhythm control signal is generated according to a target proportion corresponding to a preset trigger operation executed by a user.
In specific implementation, the client may provide a rhythm adjustment function for the user, for example, the user may execute a preset trigger operation through the client, and generate a rhythm control signal according to a target proportion corresponding to the preset trigger operation, so as to adjust a rhythm blue light proportion in a backlight of the display device. For example, the client may configure a rhythm control strip and the user sets a desired target ratio by clicking or pulling the rhythm control strip according to the needs of the actual scene. For another example, the client may also configure a rhythm selection/input box, and the user may determine the target scale by clicking on the scale listed in the drop-down list or entering the scale in the input box. The target proportion is the low blue light rejection duty ratio required by the user.
In this way, the user can adjust the low blue light rejection duty ratio at the client, and the client generates the corresponding pulse width modulation signal pmw_r through the pulse width modulation circuit according to the low blue light rejection duty ratio selected by the user. At this time, the client inputs the pmw_r to the backlight control circuit of the display terminal through one pin in the display interface in addition to the display signal and the power supply to the display terminal. Pmw_r characterizes the low-suppression blue light emission ratio in the overall backlight, that is, the ratio of the light emission intensity of the first blue light chip 101 in the above-mentioned bi-crystal LED backlight to the light emission intensity of the overall bi-crystal LED.
Second, a correspondence table of the time period and the light emission ratio of the first blue light chip 101, that is, the low suppression blue light ratio, may be stored in the backlight control circuit in advance. For example, the low-suppression blue light ratio corresponding to the 00:00 to 7:00 time period in the rhythm correspondence table may be configured to: 100%; the low-suppression blue light ratio corresponding to 7:00-9:00 is configured as follows: 50%; the low-suppression blue light ratio corresponding to 9:00-17:00 is configured as follows: 0% of the total weight of the composition; the low-suppression blue light ratio corresponding to 17:00-19:00 is configured as follows: 50%; the low-suppression blue light ratio corresponding to 19:00-24:00 is configured as follows: 80%.
Based on this, as shown in fig. 5, the above step S301 may include:
step S501, a backlight brightness control signal and a time signal are obtained from a display interface;
step S502, determining display time according to the time signal;
step S503, searching the luminous proportion of the first blue light chip corresponding to the belonged time period in a preset rhythm corresponding table according to the display time;
step S504, generating a rhythm control signal according to the searched luminous proportion of the first blue light chip. For example, the pulse width modulation circuit may be combined to generate the corresponding pulse width modulation signal pmw_r as the rhythm control signal according to the found low-suppression blue light proportion.
Third, for a display device in an automatic brightness adjustment mode, the backlight ratio can be automatically adjusted according to the ambient brightness in the automatic brightness adjustment mode. At this time, as shown in fig. 6, the step S301 may include: step S601, obtaining a backlight brightness control signal from a display interface, wherein the backlight brightness control signal is determined according to the brightness of the external environment; step S602, obtaining a rhythm control signal according to the backlight brightness control signal. For example, the backlight luminance control signal may be subjected to an inversion process to obtain the rhythm control signal, that is, if the overall backlight luminance ratio is 20%, the low-suppression blue light ratio may be 80%.
It can be understood that, in a scene with lower external environment brightness, the client can adjust the overall backlight brightness proportion to make the screen display darker, while in a scene with lower external environment brightness, the scene usually occurs in an evening period where rest is needed, and the low-suppression blue light proportion needs to be adjusted higher, so that the suppression effect on melatonin secretion is reduced, and the sleeping is easier. On the contrary, in the scene with higher external environment brightness, the client can increase the whole backlight brightness proportion, namely the screen display is brighter, and in the scene with higher external environment brightness, the scene usually occurs in the working period without paying attention to the inhibition effect on melatonin, the low inhibition blue light proportion can be reduced, and the low blue light proportion is increased, so that the human body can keep a wakefulness state.
After the backlight brightness control signal and the rhythm control signal are acquired, the first control signal and the second control signal can be generated based on the two signals. As an embodiment, the rhythm control signal may be subjected to an inversion process to obtain a non-rhythm control signal; then, multiplying the backlight brightness control signal and the rhythm control signal respectively to obtain a first control signal; and multiplying the backlight brightness control signal and the non-rhythm control signal to obtain a second control signal. By determining the first control signal and the second control signal in this way, the sum of the low blue light intensity and the low blue light intensity in the rhythm adjusting process can be basically consistent with the overall backlight brightness to be achieved, and the brightness fluctuation is less than or equal to 2% in the backlight adjusting process, so that the original backlight brightness, color coordinates and color temperature are not obviously changed.
For example, if the rhythm control signal is a PWM signal pwm_r having a duty cycle of 20%, a PWM signal pwm_n having a duty cycle of 80% can be obtained as the non-rhythm control signal after the inversion.
The backlight brightness control signal is also a pulse width modulated signal, which may be denoted PMW LED, which is used to control the light intensity of the overall backlight. For example, if the maximum brightness of an LCD (Liquid Crystal Display ) product is 400nit, when the pwm_led duty cycle is 50%, the backlight brightness is 200nit.
The multiplication operation can be carried out on the PWM_LED and the PWM_R through an MCU (Microcontroller Unit, a micro control unit) or a multiplier to obtain a first control signal PWM_LED_R; and multiplying the PWM_LED and the PWM_N to obtain a second control signal PWM_LED_N. Then, pwm_led_r may be input to the first driver 201 connected to the first blue chip 101, and pwm_led_n may be input to the second driver 202 connected to the second blue chip 102, to control the first blue chip 101 and the second blue chip 102 to emit light in corresponding proportions, respectively.
For example, an LCD product with a maximum brightness of 400nit, an input pwm_led duty cycle of 50% and a pwm_r duty cycle of 20% is shown as follows after the above signal processing: the first blue light chip 101 emits 400×50×20% =40 (nit), and the second blue light chip 102 emits 400×50×80% =160 (nit)
In the implementation, different low-suppression blue light ratios can be set in different time periods according to the requirements of actual application scenes. For example, in an application scenario, different low-suppression blue light ratios may be set in the periods of 00:00-7:00, 7:00-9:00, 9:00-17:00, 17:00-19:00, and 19:00-24:00 respectively, so as to adjust the intensity of the rhythm effect of the display device, and specific ratio examples may be configured as shown in table 1.
TABLE 1
The backlight luminance duty ratio may be adjusted from 0% to 100%, and the ratio shown in table 1 is merely illustrative. The low-suppression blue light duty ratio is obtained by multiplying the backlight luminance duty ratio by the low-suppression blue light duty ratio, and represents the duty ratio of the low-suppression blue light in the overall maximum backlight luminance, and the low-blue light duty ratio is obtained by multiplying the backlight luminance duty ratio by the low-blue light duty ratio, and represents the duty ratio of the low-blue light in the overall maximum backlight luminance. Because the blue light of the backlight source 100 is obtained by mixing low-suppression blue light and low-blue light, and the addition of the low-suppression blue light duty ratio and the low-blue light duty ratio is the backlight brightness duty ratio, the original backlight brightness, color coordinates and color temperature are not obviously changed while the rhythm adjustment of the display device is realized, and the visual experience of a user is not affected.
In an alternative embodiment, an on/off rhythm mode may be provided, for example, a rhythm switch button may be provided in the display device, and the user turns on or off the rhythm mode by clicking the rhythm switch button. In this mode, the low blue rejection ratio is either 100% or 0%. That is, when the rhythm mode is turned on, the first blue light chip 101 is controlled to be turned on, the second blue light chip 102 is turned off, and the first blue light chip 101 provides backlight with corresponding proportion; when the rhythm mode is closed, the first blue light chip 101 is controlled to be closed, the second blue light chip 102 is controlled to be opened, and the second blue light chip 102 provides backlight with corresponding proportion.
In order to implement the above-described on/off rhythm mode, the backlight control signal may include a backlight brightness control signal and an enable signal in step S301. For example, the client may input an enable signal via a pin in the display interface. At this time, as shown in fig. 7, the specific implementation procedure of the backlight control method provided in this embodiment may include: step S701, obtaining a backlight brightness control signal and an enabling signal from a display interface; in step S702, the first blue light chip or the second blue light chip is controlled to emit light according to the backlight brightness control signal according to the enable signal, so as to adjust the duty ratio of the rhythmic blue light band in the backlight.
For example, when the rhythm mode is on, the first blue light chip 101 is controlled to emit light according to the duty ratio of the backlight brightness control signal, so that the low blue light rejection ratio in the backlight is 100%, the low blue light ratio is 0%, and the duty ratio of the rhythm blue light wave band in the backlight is relatively low; when the rhythm mode is off, the enable signal is at a low level, and the second blue light chip 102 is controlled to emit light according to the duty ratio of the backlight brightness control signal, so that the low blue light rejection ratio in the backlight is 0%, the low blue light ratio is 100%, and the duty ratio of the rhythm blue light wave band in the backlight is relatively high.
According to the backlight control method provided by the embodiment of the invention, the inhibition degree of the display light on melatonin secretion can be adjusted by adjusting the duty ratio of the rhythm blue light wave band in the light emitted by the backlight 100, so that the display device with the rhythm adjusting function is realized, and the healthy display function of the display device is enriched.
Based on the same inventive concept, the embodiment of the invention also provides a backlight control circuit for implementing the backlight control method provided by the method embodiment. Specifically, the backlight control circuit may include: a first sub-circuit and a second sub-circuit.
The first sub-circuit is used for acquiring a backlight control signal. And the second sub-circuit is used for adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion. The specific implementation process may refer to the related description in the above method embodiment, and will not be repeated here.
An exemplary backlight control circuit structure shown in fig. 8 is described below in the case where the backlight 100 includes the first blue chip 101 and the second blue chip 102 described above. In other embodiments of the present invention, on the premise that the backlight control method provided in the above method embodiment can be implemented, the backlight control circuit may also have other different circuit structures, which is not limited herein.
As shown in fig. 8, the second sub-circuit may include: a controller 210, a first driver 201, and a second driver 202.
The controller 210 is configured to obtain a first control signal and a second control signal according to the obtained backlight control signal. The first driver 201 and the second driver 202 are LED drivers. The first driver 201 is connected to the controller 210 and the first blue light chip in the backlight 100, respectively, and is configured to control a light emitting ratio of the first blue light chip according to the first control signal. The second driver 202 is connected to the controller 210 and the second blue light chip in the backlight 100, respectively, and is configured to control the light emitting ratio of the second blue light chip according to the second control signal. The specific implementation process may refer to the corresponding description in the above method embodiments, and will not be repeated here.
In an alternative embodiment, the backlight control signal comprises: backlight brightness control signals and rhythm control signals. The controller 210 is connected to the client through the display interface 220, and acquires the backlight brightness control signal and the rhythm control signal input by the client from the display interface 220. At this time, the controller 210 may include: a processing unit 211 and an inverter 212. The inverter 212 is connected to a pin of the display interface 220 for inputting a rhythm control signal, and is used for inverting the obtained rhythm control signal to obtain a non-rhythm control signal. The processing unit 211 is connected to the inverter 212, the first driver 201, and the second driver 202, and is configured to multiply the input backlight brightness control signal and the rhythm control signal, and output a first control signal to the first driver 201; and multiplying the input backlight brightness control signal with the non-rhythm control signal to output a second control signal to the second driver 202. For example, the processing unit 211 may be an MCU or a multiplier. The specific implementation process may refer to the corresponding description in the above method embodiments, and will not be repeated here.
Based on the same inventive concept, the embodiment of the invention also provides a display device, and the backlight source is controlled to emit light by the backlight control method provided by the embodiment of the method corresponding to fig. 3. Specifically, as shown in fig. 9, the display device 90 may include the backlight control circuit 900 provided in the above embodiment and the backlight 100, where the backlight control circuit 900 is connected to the backlight 100 for controlling the backlight 100 to emit light. It should be noted that, the specific structures of the backlight control circuit 900 and the backlight 100 may refer to the related descriptions in the above embodiments, and will not be described herein. For example, the display device 90 may be an LCD display, a tablet computer, a notebook computer, a mobile phone, or other devices with display functions.
Based on the same inventive concept, the embodiment of the invention also provides a backlight control method applied to the display device. As shown in fig. 10, the method includes:
step S1001, when detecting that a user performs a preset trigger operation for adjusting the rhythm blue light proportion, determining a target proportion corresponding to the preset trigger operation;
step S1002, generating a rhythm control signal according to a target proportion;
step S1003, adjusting the duty ratio of the rhythm blue light band in the light emitted by the backlight source according to the rhythm control signal and the backlight brightness control signal, wherein the backlight brightness control signal is used for controlling the overall brightness of the backlight, and the rhythm blue light band is a blue light band for inhibiting melatonin secretion.
In specific implementation, the proportion-adjustable rhythmic blue light mode can be preconfigured in the display device, and a user can adjust the proportion of rhythmic blue light in the backlight of the display device by executing preset triggering operation on the display device. For example, a rhythm control strip may be configured in the display device, and a user may set a desired target ratio by clicking or pulling the rhythm control strip according to the needs of an actual scene.
For example, the target ratio may be the light emission ratio of the first blue light chip in the backlight structure exemplified above, i.e., the low suppression blue light ratio. The pulse width modulation circuit generates a pulse width modulation signal corresponding to the rhythm adjustment ratio as a rhythm control signal. And then, according to the rhythm control signal and the backlight brightness control signal, generating a first control signal and a second control signal, and respectively controlling the light emitting proportion of the first blue light chip and the second blue light chip, thereby adjusting the duty ratio of the rhythm blue light wave band in the light emitted by the backlight source. The specific implementation process may refer to the corresponding description in the above method embodiments, and will not be repeated here.
Based on the same inventive concept, the embodiment of the invention also provides a display device, and the backlight control method provided by the embodiment of the method shown in fig. 10 controls the backlight to emit light. For example, the display device may be a tablet computer, a notebook computer, a mobile phone or other devices with man-machine interaction function and display function.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, etc. do not denote any order. These words may be interpreted as names.
Claims (15)
1. A backlight control method, the method comprising:
acquiring a backlight control signal;
and adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
2. The method of claim 1, wherein the backlight includes a first blue chip whose emission band filters out the rhythmic blue band and a second blue chip whose emission band covers the rhythmic blue band, and wherein adjusting the duty ratio of the rhythmic blue band in the light emitted from the backlight according to the backlight control signal includes:
obtaining a first control signal and a second control signal according to the backlight control signal;
and controlling the light emitting proportion of the first blue light chip according to the first control signal, and controlling the light emitting proportion of the second blue light chip through the second control signal.
3. The method of claim 2, wherein the backlight control signal comprises: the backlight brightness control signal is used for controlling the overall brightness of backlight, the rhythm control signal is used for controlling the light emitting proportion of the first blue light chip, and the first control signal and the second control signal are obtained according to the backlight control signal, and the backlight brightness control signal comprises:
and generating the first control signal and the second control signal according to the backlight brightness control signal and the rhythm control signal.
4. A method according to claim 3, wherein said obtaining a backlight control signal comprises:
acquiring the backlight brightness control signal and a time signal from a display interface;
determining display time according to the time signal;
searching the light emitting proportion of the first blue light chip corresponding to the belonged time period in a preset rhythm corresponding table according to the display time, wherein the corresponding relation between the time period and the light emitting proportion of the first blue light chip is stored in the rhythm corresponding table;
and generating the rhythm control signal according to the light emitting proportion of the first blue light chip.
5. A method according to claim 3, wherein said obtaining a backlight control signal comprises:
the backlight brightness control signal is obtained from a display interface and is determined according to the brightness of the external environment;
and obtaining the rhythm control signal according to the backlight brightness control signal.
6. A method according to claim 3, wherein said obtaining a backlight control signal comprises:
and acquiring the backlight brightness control signal and the rhythm control signal from a display interface, wherein the rhythm control signal is generated according to a target proportion corresponding to a preset trigger operation executed by a user.
7. The method of claim 3, wherein generating the first and second control signals from the backlight brightness control signal and the rhythm control signal comprises:
performing inverse processing on the rhythm control signal to obtain a non-rhythm control signal;
multiplying the backlight brightness control signal and the rhythm control signal to obtain the first control signal;
and multiplying the backlight brightness control signal and the non-rhythm control signal to obtain the second control signal.
8. The method of claim 1, wherein the backlight includes a first blue chip whose emission band filters out the rhythmic blue band and a second blue chip whose emission band covers the rhythmic blue band, wherein the backlight control signal includes a backlight brightness control signal for controlling the overall brightness of the backlight and an enable signal, and wherein the adjusting the duty ratio of the rhythmic blue band in the light emitted from the backlight according to the backlight control signal includes:
and controlling the first blue light chip or the second blue light chip to emit light according to the backlight brightness control signal according to the enabling signal.
9. The method of claim 1, wherein the rhythmic blue band is: 450 nm-480 nm.
10. A backlight control circuit, comprising:
a first sub-circuit for acquiring a backlight control signal;
and the second sub-circuit is used for adjusting the duty ratio of a rhythm blue light wave band in light emitted by the backlight source according to the backlight control signal, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
11. A backlight control circuit as claimed in claim 10, wherein the backlight comprises a first blue chip whose emission band filters out the rhythmic blue band and a second blue chip whose emission band covers the rhythmic blue band, the second sub-circuit comprising:
the controller is used for obtaining a first control signal and a second control signal according to the acquired backlight control signal;
the first driver is connected with the controller and the first blue light chip and is used for controlling the light emitting proportion of the first blue light chip according to the first control signal;
and the second driver is connected with the controller and the second blue light chip and is used for controlling the light emitting proportion of the second blue light chip according to the second control signal.
12. The backlight control circuit of claim 11, wherein the backlight control signal comprises: a backlight brightness control signal and a rhythm control signal, the controller comprising:
the inverter is used for inverting the acquired rhythm control signal to obtain a non-rhythm control signal;
the processing unit is connected with the inverter, the first driver and the second driver and is used for multiplying the backlight brightness control signal and the rhythm control signal to obtain the first control signal; and multiplying the backlight brightness control signal and the non-rhythm control signal to obtain the second control signal.
13. A backlight, comprising: the blue light emitting chip with adjustable luminous duty ratio of the rhythm blue light wave band is used for emitting backlight with different luminous duty ratios of the rhythm blue light wave band under the action of the backlight control method of any one of claims 1-9, wherein the rhythm blue light wave band is a blue light wave band for inhibiting melatonin secretion.
14. The backlight of claim 13, wherein the blue light emitting chip comprises:
the first blue light chip of the rhythm blue light wave band is filtered by the light-emitting wave band, and the second blue light chip of the rhythm blue light wave band is covered by the light-emitting wave band, and the first blue light chip and the second blue light chip are driven by different drivers.
15. A display device comprising the backlight control circuit of any one of claims 10-12 and the backlight of claim 13 or 14, the backlight control circuit being connected to the backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111236124.6A CN116013206A (en) | 2021-10-22 | 2021-10-22 | Backlight control method, control circuit, backlight source and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111236124.6A CN116013206A (en) | 2021-10-22 | 2021-10-22 | Backlight control method, control circuit, backlight source and display device |
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| Publication Number | Publication Date |
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| CN116013206A true CN116013206A (en) | 2023-04-25 |
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| CN202111236124.6A Pending CN116013206A (en) | 2021-10-22 | 2021-10-22 | Backlight control method, control circuit, backlight source and display device |
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| CN (1) | CN116013206A (en) |
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