CN113870805B - Backlight control method, device, system and storage medium - Google Patents
Backlight control method, device, system and storage medium Download PDFInfo
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- CN113870805B CN113870805B CN202111208559.XA CN202111208559A CN113870805B CN 113870805 B CN113870805 B CN 113870805B CN 202111208559 A CN202111208559 A CN 202111208559A CN 113870805 B CN113870805 B CN 113870805B
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention provides a backlight control method, device and system and a storage medium. The method comprises the following steps: determining the target brightness of the next frame corresponding to the backlight module according to the display data of the next frame corresponding to the liquid crystal panel; determining the adjusting brightness of the backlight module according to the current brightness of the backlight module, wherein the difference value between the adjusting brightness and the current brightness is larger than the difference value between the target brightness and the current brightness; and controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness. The backlight control method, the device, the system and the storage medium provided by the invention can improve the flexibility by controlling and adjusting the output value of the brightness amplification panel under the condition of greatly changing the gray scale, and can control the adjustment brightness displayed by the backlight module to gradually change into the target brightness, so that the final brightness is accelerated to reach the required target brightness, the response time can be effectively shortened, namely, the response time of the final image sensed by a user is improved, and the user experience is improved.
Description
Technical Field
The present invention relates to backlight control technologies, and in particular, to a method, an apparatus, a system, and a storage medium for controlling backlight.
Background
With the development of science and technology and the continuous improvement of living standard of people, a Liquid Crystal display screen has become a mainstream technology of flat panel display due to the reasons of low power consumption, light weight, gorgeous color and the like, and is widely applied to electronic products of daily consumption, and the driving reaction speed of Liquid Crystal (LC) used for a Liquid Crystal display screen panel is slow, so that the response time of image output is long, and the phenomenon that the afterimage of the previous image is remained for a long time is easy to occur.
In the prior art, the OD (Over Drive) technology is generally used to improve the above phenomenon, and the response time is shortened by amplifying the value output to the liquid crystal display panel, but the value output to the panel has the lowest and highest working ranges for normal operation, and the lowest value is 0% gray and the highest value is 100% gray. If the gradation is changed greatly, such as when the image of 0% or 100% gradation is repeatedly output, there is no room for enlarging the operation range of the panel output value, and the flexibility is low.
Disclosure of Invention
The invention provides a backlight control method, device and system and a storage medium, which are used for solving the problems of long response time and poor experience of users in watching output images.
In a first aspect, the present invention provides a backlight control method, including: determining the target brightness of the next frame corresponding to the backlight module according to the display data of the next frame corresponding to the liquid crystal panel; determining the adjusted brightness of the backlight module according to the current brightness of the backlight module, wherein the difference value between the adjusted brightness and the current brightness is larger than the difference value between the target brightness and the current brightness; and controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness.
Optionally, determining the adjusted brightness of the backlight module according to the current brightness of the backlight module includes: determining the current brightness of the backlight module; if the target brightness is larger than the current brightness, adding the target brightness and a positive brightness value to obtain the adjusted brightness; and if the target brightness is smaller than the current brightness, subtracting the positive brightness value from the target brightness to obtain the adjusted brightness.
Optionally, determining the current brightness of the backlight module includes: and determining the positive brightness value according to the difference value between the target brightness and the current brightness and/or the attribute information of the liquid crystal panel.
Optionally, controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness, includes: and controlling the backlight module to gradually increase or decrease from the adjusted brightness to the target brightness according to the step-like change.
Optionally, controlling the backlight module to gradually increase or decrease from the adjusted brightness to the target brightness according to a step-like change includes: determining a change time length from the adjusted brightness to the target brightness and the number of steps; wherein the change duration is less than the duration of one frame of picture; determining the duration and the continuous brightness of each step according to the change duration, the number of steps, the target brightness and the adjusted brightness; and controlling the backlight module to gradually change the adjusted brightness into the target brightness according to the duration and the continuous brightness of each step.
Optionally, determining a duration of the change from the adjusted brightness to the target brightness includes: and determining the duration of the change according to the response time of the liquid crystal panel.
Optionally, the method further includes: and if the liquid crystal panel has the function of driving the over-frequency OD, determining the change time according to the OD time of the liquid crystal panel.
In a second aspect, the present invention also provides a backlight control apparatus, comprising: a memory and at least one processor; the memory stores computer execution instructions; execution of the computer-executable instructions stored by the memory by the at least one processor causes the at least one processor to perform the method of any one of the first aspects.
In a third aspect, the present invention further provides a backlight control system, including: the backlight control equipment and the backlight module set of the second aspect; wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
In a fourth aspect, the present invention also provides a computer-readable storage medium having stored therein computer-executable instructions for implementing the method according to any one of the first aspect when executed by a processor.
According to the backlight control method, the device, the system and the storage medium, the target brightness of the next frame corresponding to the backlight module is determined according to the display data of the next frame corresponding to the liquid crystal panel; further, determining the adjusted brightness of the backlight module according to the current brightness of the backlight module, wherein the difference value between the adjusted brightness and the current brightness is larger than the difference value between the target brightness and the current brightness, controlling the backlight module to display the adjusted brightness after determining the adjusted brightness, and gradually changing the adjusted brightness into the target brightness. Therefore, the response time can be effectively shortened, the phenomenon that the residual image is remained for a long time is improved, the flexibility is improved, and the user experience is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1A is a schematic diagram of a liquid crystal display panel for overall dimming;
FIG. 1B is a schematic diagram of a local dimming scheme for an LCD panel;
FIG. 2 is a schematic diagram of a vertical structure of a local dimming LED backlight LCD panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an application scenario provided in the embodiment of the present invention;
FIG. 4A is a diagram illustrating required current values corresponding to various stages of an LCD panel;
FIG. 4B is a schematic diagram of the response time of an LCD panel;
FIG. 5 is a schematic diagram of a device with OD functionality;
FIG. 6A is a schematic illustration of the available operating range for an OD function as shown in FIG. 5;
FIG. 6B is a schematic illustration of the usable operating range of an OD function as shown in FIG. 5;
FIG. 6C is a schematic illustration of the available operating range for another OD function shown in FIG. 5;
FIG. 6D is a schematic illustration of the useful operating range of another OD function shown in FIG. 5;
fig. 7 is a flowchart illustrating a backlight control method according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a backlight control system according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a principle of static backlight control and dynamic backlight control according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The words "if", as used herein may be interpreted as "at \8230; \8230whenor" when 8230; \8230when or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or system comprising the element.
The method provided by the embodiment of the invention can be applied to any field needing backlight control. Fig. 1A is a schematic diagram illustrating a principle of overall dimming of a liquid crystal display panel, as shown in fig. 1A, an upper portion of an image in fig. 1A represents a picture displayed after dimming, a lower portion of the image represents backlight data of a backlight module, and a whole page displays the same backlight gray scale, i.e., the same brightness, wherein an arrow represents an area to be adjusted.
It can be understood that, in a Liquid Crystal Display (LCD) panel using Global dimming, if the LCD panel is operated in a state of always turning on a backlight, the response time of the LCD is reflected as it is until a final result generates an afterimage, and thus, a mini Light Emitting Diode (LED), which may be an LED device having a chip size of 50 to 200 μm, may be used to implement a backlight function.
Fig. 1B is a schematic diagram illustrating a principle of local dimming of a liquid crystal display panel, as shown in fig. 1B, a plurality of mini LEDs may be used as a backlight module to control backlight gray levels according to each region, so as to perform local dimming of the liquid crystal display LCD panel, an upper part of an image in fig. 1B represents a picture displayed after dimming, and a lower part of the image represents a part of backlight data of the backlight module, wherein only a region where a part of arrows are located has backlight gray levels, and since the backlight gray levels can be controlled differently according to each region, contrast of the image can be improved and power consumption can be reduced. In addition, in the local dimming LCD panel, the gray scale of the backlight and the transmittance of the LCD panel may be simultaneously adjusted to form a final image seen by a user.
For example, fig. 2 is a schematic diagram of a vertical structure of a local dimming LED backlight LCD panel according to an embodiment of the present invention, as shown in fig. 2, the LCD panel itself cannot emit light, and therefore the LCD panel needs a backlight module as a light source, and therefore a plurality of mini LEDs can be used as a light source of the backlight module to emit light for displaying various information such as text, graphics, images, animation, video, and video signals.
The following explains an application scenario provided by an embodiment of the present invention:
fig. 3 is a schematic view of an application scenario provided in the embodiment of the present invention. As shown in fig. 3, when the user 301 is watching a tv program, the LCD panel 302 may emit light through the backlight module behind the screen, and accordingly, the user 301 may see the picture information displayed by the LCD panel 302.
Since the driving reaction speed of the LC of the LCD panel 302 is slow, the response time of the image output displayed by the LCD panel 302 may be long, resulting in a phenomenon in which an afterimage of the previous image remains for a long time.
For example, if the difference between the currently output frame data and the previous frame data is large, it takes a long time to reach the required output value, fig. 4A is a schematic diagram of the required current value corresponding to each stage of the liquid crystal display panel, as shown in fig. 4A, when one frame data arrives at the LCD panel, the difference between the frame data and the previous frame data is large, the current value of the previous liquid crystal display needs to sequentially pass through the current value of the actual liquid crystal display and the current value of the ideal liquid crystal display, and fig. 4B is a schematic diagram of the response time of the liquid crystal display panel, as shown in fig. 4B, the current value of the previous liquid crystal display needs to immediately rise to the current value of the ideal liquid crystal display for displaying the picture, but in practice, the current value of the actual liquid crystal display can rise to the current value of the ideal liquid crystal display after a rise period (i.e., the response time).
It should be noted that the general response time of the LCD panel is several ms units, and the general response time of the backlight LED is several us units, so that the response time is very short compared with the response time of the LCD panel, and thus the phenomenon of residual image may occur.
Among some technologies, in order to improve the response time of the LCD panel, the most widely used technology is Over-Drive (OD). The LC using the OD technology mainly provides an overshot voltage (i.e., an overshoot voltage) for one frame time, and further undergoes a process of going up and down once within one frame time and finally falling back to a target current, fig. 5 is a schematic diagram of a principle having an OD function, as shown in fig. 5, the OD function is to provide an overshoot voltage within one frame time by comparing previous output image data with current output image data and amplifying the current output image data according to the comparison result, and the LCD panel can reach a desired output value (i.e., a target current) more quickly by amplifying the output data.
Specifically, fig. 6A is a schematic diagram of an available working range of an OD function shown in fig. 5, which can amplify a current value output to the LCD panel by an OD technique to shorten a response time. As shown in fig. 6A, when a frame of data reaches the LCD panel, the current value of the liquid crystal display is amplified to exceed the target current range by using the OD technique, and the current value of the OD liquid crystal display is greater than the target current, fig. 6B is a schematic diagram of the usable working range of the OD function shown in fig. 5, and as shown in fig. 6B, the current value output to the LCD panel is highly amplified to exceed the target current range of the LCD within a frame time, so that the LCD panel accelerates reaching the target current. Fig. 6C is a schematic diagram of another working range of the OD function shown in fig. 5, which can amplify the current value output to the LCD panel by the OD technology to shorten the response time. As shown in fig. 6C, when one frame of data reaches the LCD panel, the current value of the liquid crystal display is amplified to exceed the target current range by using the OD technique, and the current value of the OD liquid crystal display is smaller than the target current, fig. 6D is a schematic diagram of the usable operating range of another OD function shown in fig. 5, and as shown in fig. 6D, the current value output to the LCD panel is amplified to exceed the target current range of the LCD within one frame time, so that the LCD panel accelerates reaching the target current.
However, the current value outputted to the panel has the lowest and highest operation ranges for normal operation, and usually corresponds to the lowest value of 0% gradation and the highest value of 100% gradation. If the gradation is changed greatly, such as when the image of 0% or 100% gradation is repeatedly output, there is no room for enlarging the operation range of the panel output value, and the flexibility is low.
In view of this, an embodiment of the present invention provides a backlight control method, which may determine a target brightness of a next frame corresponding to a backlight module according to display data of the next frame corresponding to a liquid crystal panel; further, according to the current brightness of the backlight module, determining the adjusted brightness of the backlight module, wherein the difference value between the adjusted brightness and the current brightness is larger than the difference value between the target brightness and the current brightness, after the adjusted brightness is determined, controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness. Therefore, under the condition that the gray scale is greatly changed, the output value of the brightness amplification panel can be controlled and adjusted, the flexibility is improved, and the adjustment brightness displayed by the backlight module can be controlled to gradually change into the target brightness, so that the final brightness can quickly reach the required target brightness, the response time can be effectively shortened, namely the response time of the final image sensed by a user is improved, and the user experience is improved.
The following describes the technical solution of the present invention and how to solve the above technical problems in detail by specific examples. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 7 is a flowchart illustrating a backlight control method according to an embodiment of the present invention. As shown in fig. 7, the method includes:
s701, determining the target brightness of the next frame corresponding to the backlight module according to the display data of the next frame corresponding to the liquid crystal panel.
In an embodiment of the present invention, the backlight module, which may also be referred to as a backlight unit, may be configured to provide a backlight function for the LC panel, and is configured to locally adjust the brightness of the backlight module by selecting the mini LEDs as light sources of the backlight module, where light-emitting elements of the mini LEDs include current and/or data, and the data may be backlight image data or PWM data.
Specifically, each mini LED in the backlight module corresponds to a different gray value, and the mini LED can be controlled to display corresponding brightness based on the gray value.
The target brightness may refer to the brightness required for displaying the display data of the next frame, and the target brightness has a corresponding gray value.
For example, the gray value of the next frame corresponding to the mini LED of the backlight module light source can be further determined according to the display data of the next frame corresponding to the liquid crystal panel. For example, the display data may be a color image, the target brightness of the backlight module may be a grayscale image corresponding to the color image, and each mini LED in the backlight module may determine a corresponding grayscale value according to its position in the image.
S702, determining the adjusting brightness of the backlight module according to the current brightness of the backlight module, wherein the difference value between the adjusting brightness and the current brightness is larger than the difference value between the target brightness and the current brightness.
In the embodiment of the invention, the brightness seen by the last user can refer to the superposition of the brightness of the LCD panel and the backlight module, the display effect of the brightness seen by the last user is gradually improved by adjusting the current brightness of the backlight module, and the adjustment brightness of the backlight module needs to be determined in the process.
Specifically, the time for the gray value to quickly reach the gray value required by the next frame can be further shortened by adjusting the gray value of the backlight module within the response time, that is, the gray value of the backlight module corresponding to the brightness to be adjusted is determined according to the gray value corresponding to the current brightness of the backlight module, wherein the difference between the gray value of the brightness to be adjusted and the gray value of the current brightness is greater than the difference between the gray value corresponding to the target brightness and the gray value corresponding to the current brightness.
For example, taking the situation of rising of the output gray scale as an example, the gray scale value corresponding to the brightness that needs to be raised of the backlight module may be determined according to the gray scale value corresponding to the current brightness of the backlight module, and further, the gray scale value of the backlight module within the response time is raised, so that the final gray scale is raised quickly.
And S703, controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness.
Specifically, if the backlight gray scale of the next frame is greater than the backlight gray scale of the current frame, after the brightness of the backlight module is increased to the gray scale value corresponding to the required brightness, the gray scale value corresponding to the brightness of the backlight module is adjusted to be gradually reduced so that the gray scale value does not exceed the gray scale value corresponding to the target brightness, that is, under the condition that the gray scale of the LCD panel reaches the final target value, the gray scale value corresponding to the adjusted brightness of the backlight module is further gradually reduced to be the final gray scale, where the final gray scale corresponds to the target brightness;
if the backlight gray of the next frame is less than the backlight gray of the current frame, after the brightness of the backlight module is reduced to the gray value corresponding to the required brightness, the gray value corresponding to the brightness of the backlight module is adjusted to be gradually increased so that the gray value does not exceed the gray value corresponding to the target brightness, namely, under the condition that the gray of the LCD panel reaches the final target value, the gray value corresponding to the adjusted brightness of the backlight module is further gradually increased to be the final gray, and the final gray corresponds to the target brightness.
For example, taking the case that the current output gray scale increases as an example, as the gray scale of the LCD panel increases, the gray scale value corresponding to the brightness of the backlight module is further adjusted to gradually decrease and change to the target brightness corresponding to the required target gray scale value.
Therefore, compared with fig. 4A-4B, when the liquid crystal panel does not have the function of driving the overdrive OD, the present invention can determine the adjusted brightness of the backlight module, i.e., amplify the brightness of the backlight module, and further adjust the final brightness to reach the desired display brightness as soon as possible, thereby improving the response time, and compared with fig. 5 and 6A-6D, when the liquid crystal panel has the function of driving the overdrive OD, the present invention can determine the adjusted brightness of the backlight module first, and even under the condition that the gray scale is changed greatly (i.e., the condition shown in fig. 6A-6D), the adjusted brightness can be controlled to amplify the panel output value, the flexibility of the adjustable range is high, and further the brightness of the backlight module can be controlled to gradually change to the desired target brightness according to the adjusted brightness, thereby the final brightness reaches the desired target brightness, while fig. 5 and 6A-6D directly change the panel output value, and an instant overshoot voltage is subjected to a rise and fall once, thereby easily achieving the "target voltage" and the "phenomenon of the user is not easily experienced" gradually and the user's final brightness is not easily reduced, and the user's feeling of the present invention is easily achieved at the target point, and the user's perception is not easily.
It can be understood that the method provided by the embodiment of the invention can be applied to a backlight control system. Fig. 8 is a schematic diagram of a backlight control system according to an embodiment of the present invention, and as shown in fig. 8, the backlight control system may include a Timing Controller (Timing Controller), a dimming Controller (Dimmer Controller), and an LED Driver (LED Driver).
Wherein the timing controller is configured to send the backlight image data to the dimming controller. Optionally, the timer may obtain a display image from a data source and send the display image to the LCD panel, and may also generate corresponding backlight image data according to the display image and send the backlight image data to the dimming controller. The display frame of the LCD panel may be a color frame, the backlight image data may be gray scale image data corresponding to the color frame, and the mini LEDs at different positions may correspond to the same or different gray scale values.
And the dimming controller is used for determining the duty ratio and/or the current value of the PWM signal according to the backlight image data and sending the duty ratio and/or the current value to the LED driver. Alternatively, different gray values may correspond to different duty ratios or current values, so that the mini LED may display the brightness corresponding to the gray values. Generally, the larger the duty cycle and current value, the brighter the mini LED.
And the LED driver is used for outputting a corresponding PWM signal to the mini LED according to the duty ratio and/or the current value. Optionally, there may be more than one LED driver, and each LED driver may control one or more mini LEDs.
The execution subject of the method provided by the embodiments of the present invention may be at least one of the timing controller, the dimming controller and the LED driver.
Optionally, determining the adjusted brightness of the backlight module according to the current brightness of the backlight module includes: determining the current brightness of the backlight module; if the target brightness is greater than the current brightness, adding the target brightness and a positive brightness value to obtain the adjusted brightness; and if the target brightness is greater than the current brightness, subtracting the positive brightness value from the target brightness to obtain the adjusted brightness.
In the embodiment of the invention, the effect of adjusting the brightness is further achieved by adjusting the gray value of the backlight module, so that when the brightness of the backlight module is adjusted, the gray value of the backlight module can be specifically adjusted. Optionally, the adjusting gray scale value may be an amount of white in the image data obtained by the adjusting custom controller, the custom controller may receive the image data and a plurality of driving signals input from the outside, and generate the gate control signal and the data control signal according to the plurality of driving signals, further, the gray scale of the amount of white in the image data may be adjusted, and further, the custom controller controls the backlight module to gradually adjust the amount of white in the image data to a desired target gray scale, where the target gray scale corresponds to the target brightness.
Optionally, the adjusting gray value may be a gray value of the backlight image data obtained by the adjusting dimming controller, and further, the dimming controller controls the backlight module to gradually change the gray value of the backlight image data into a desired target gray value, where the target gray value corresponds to the target brightness.
Optionally, the gray scale value may be adjusted by adjusting a duty ratio and/or a current value of a PWM signal obtained by the LED driver, where the duty ratio and/or the current value of the PWM signal may correspond to different gray scale values, and further, the LED driver controls the duty ratio and/or the current value to output a corresponding PWM signal to the mini LED to adjust and control the gray scale value of the backlight module to gradually change to a required target gray scale, where the target gray scale corresponds to target brightness.
Exemplarily, the current brightness of the backlight module corresponding to the liquid crystal display screen can be determined; further, the current brightness and the target brightness to be adjusted are judged, if the target brightness is greater than the current brightness, the target brightness is added to the positive brightness value to obtain the adjusted brightness, if the target brightness is greater than the current brightness, the target brightness is subtracted from the positive brightness value to obtain the adjusted brightness, and further, the backlight module can be adjusted according to the gray value corresponding to the adjusted brightness.
Therefore, the required adjusting brightness can be determined by adding or subtracting the preset positive brightness value according to the current brightness of the backlight module, the flexibility is improved, the backlight module can be suitable for various conditions, and the adaptability is wide.
Optionally, determining the current brightness of the backlight module includes: and determining the positive brightness value according to the difference value between the target brightness and the current brightness and/or the attribute information of the liquid crystal panel.
In the embodiment of the present invention, the attribute information may refer to parameter information such as brightness, contrast, color, and a viewing angle.
For example, the absolute value of the difference may be taken according to the difference between the target brightness and the current brightness, and the difference is, regardless of whether the difference is positive or negative, so that the absolute value may be determined to be a positive brightness value, and the positive brightness value may be further determined according to parameter information of the brightness, the contrast, the color, the viewing angle, and the like of the liquid crystal panel, for example, a certain brightness value is taken to be a positive brightness value which is larger than the brightness, the contrast, the color, the viewing angle, and the like of the current liquid crystal panel.
The positive brightness value may also be determined according to a difference between the target brightness and the current brightness and parameter information such as brightness, contrast, color, and a viewing angle of the liquid crystal panel, for example, a reference value may be determined according to the difference between the target brightness and the current brightness, and further, whether the reference value is greater than the brightness, contrast, color, and viewing angle of the current liquid crystal panel is determined based on the brightness, contrast, color, and viewing angle of the current liquid crystal panel, if yes, the reference value is determined to be the positive brightness value, and if not, a larger reference value is determined again according to the difference between the target brightness and the current brightness, until the requirement is met.
Therefore, the required positive brightness value can be determined in various modes, the brightness value is matched with the attribute information of the liquid crystal panel, the use requirements of different types of liquid crystal panels can be met, the use range is wide, and the flexibility is high.
Optionally, controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness, includes: and controlling the backlight module to gradually increase or decrease the adjusted brightness to the target brightness according to the step-shaped change.
In the embodiment of the present invention, the step-like change may refer to a change in which the trend is a series of step-like trapezoids, and the change is descending or ascending according to a certain rule.
For example, after the adjusted brightness of the backlight module is determined, the backlight module may be controlled to gradually increase or decrease from the gray-level value corresponding to the adjusted brightness to the required target gray-level value according to a step-like change, where the gray-level value corresponds to the required target brightness.
Therefore, the brightness can be adjusted to the required target brightness according to the step-shaped change, the operation process is simple, and the response time of reaching the target brightness can be shortened.
Optionally, controlling the backlight module to gradually increase or decrease from the adjusted brightness to the target brightness according to a step-like change includes: determining a change time length from the adjusted brightness to the target brightness and the number of steps; wherein the change duration is less than the duration of one frame of picture; determining the duration and the continuous brightness of each step according to the change duration, the number of steps, the target brightness and the adjusted brightness; and controlling the backlight module to gradually change the adjusted brightness into the target brightness according to the duration and the continuous brightness of each step.
In the embodiment of the present invention, the change duration may refer to a time required for adjusting the brightness to reach the target brightness according to the step-like change within one frame time, for example, the change duration may be 1/2 frame; the number of steps may refer to the number of step changes required when the adjusted luminance reaches the target luminance in a stepwise change within one frame time, and for example, the number of steps may be 4.
The duration may refer to a duration that each step can last, and the continuous brightness may refer to a brightness that each step can last, for example, the duration of the change may be 1/2 frame, there are 4 steps, the durations that the first step to the fourth step can last are all 1/8 frame, and the gray-level values of the continuous brightness corresponding to the 4 steps are 10, 6, 4, and 1, respectively.
It is understood that, in a frame time, the duration corresponding to each step may be different or the same, but the continuous brightness is different, and this is not particularly limited in the embodiment of the present invention.
It should be noted that the brightness of the backlight module may be adjusted by changing the current value or the voltage value within one frame time, and the method for adjusting the brightness of the backlight module is not particularly limited in the embodiment of the present invention.
Illustratively, the duration of the change from the adjusted brightness to the target brightness within the duration of one frame of picture may be determined as 1/2 frame, the number of steps is 4, further, if the steps are uniformly changed, the duration of the change from 1/2 frame may be divided by the number of 4 steps, the duration of each step may be 1/8 frame, the adjusted brightness is subtracted from the target brightness, and then the number of 4 steps is divided, so as to obtain the duration of each step, further, if the steps are not uniformly changed, the duration of each step may be determined as 1/8 frame, 1/4, 3/8, 1/4, and multiplying the duration of 1/2 frame by the weight corresponding to the number of 4 steps, the duration of each step may be determined as 1/16 frame, 1/8 frame, 3/16 frame, and 1/8 frame, and multiplying the adjusted brightness by the target brightness, and then the duration of 4 steps by the weight corresponding to obtain the duration of each step, and the brightness of each step may be further determined as the brightness of the target brightness, and the backlight module may be controlled according to the required duration of the steps.
It should be noted that, in the embodiment of the present invention, an algorithm for determining the duration and the continuous brightness of each step is not specifically limited, and the above method is only exemplary, where the weight corresponding to the set number of steps may be determined according to the situation, or may be modified manually, and the present invention is not specifically limited to this.
Therefore, the duration and the continuous brightness of each step can be determined based on various algorithms according to the change duration, the number of steps, the target brightness and the adjustment brightness, the brightness is further adjusted to be gradually changed into the target brightness, the calculation accuracy and the calculation speed can be improved, and the duration and the continuous brightness corresponding to each step are more reasonable.
Optionally, determining a duration of the change from the adjusted brightness to the target brightness includes: and determining the duration of the change according to the response time of the liquid crystal panel.
In the embodiment of the present invention, the response time may refer to a speed of each pixel point of the liquid crystal display reacting to an input signal, that is, a time required for the pixel to change from dark to light or from light to dark, and the principle is to apply a voltage in the liquid crystal molecules to twist and restore the liquid crystal molecules, for example, the response time may be 25ms.
For example, the response time of the liquid crystal panel may be determined to be 25ms, 48 frames are set for 1 second, the duration of the change of the backlight module from the adjusted brightness in the staircase shape is less than the response time, the weight ratio of the change duration to the response time may be set, for example, the change duration is set to be 2/3 of the response time, and the change duration may be determined to be 48/1000 × 25 × 2/3=4/5 frames according to the response time.
It should be noted that the response time is a time set by the user to be reached, how many frames can be modified manually within 1 second, the definition is different for different frames, and the weight ratio of the response time occupied by the variable duration is not particularly limited in the present invention.
Therefore, when the time length of the change from the adjustment brightness to the target brightness is determined, the time length can be determined through the response time of the liquid crystal panel, the calculation accuracy is improved, and the time for reaching the target brightness is shortened.
Optionally, the method further includes: and if the liquid crystal panel has the function of driving the over-frequency OD, determining the change time according to the OD time of the liquid crystal panel.
In an embodiment of the present invention, the OD time may refer to a time taken by the OD technique to amplify a value output to the liquid crystal display panel within one frame time, for example, the OD time may be 10ms, and the response time may include the OD time.
For example, if the lcd panel has the function of driving the overdrive OD, 48 frames may be set for 1 second according to the OD time 10ms and the response time 25ms of the lcd panel, the change time of the backlight module from the adjusted brightness in the staircase shape should be less than the difference between the response time and the OD time, a weight ratio of the change time to the difference may be set, for example, the change time may be set to 2/3 of the interpolation value, the change time may be determined to be 48/1000 (25-10) = 2/3=12/25 frames according to the response time, and further, the change time may be determined to be 12/25 frames.
It can be seen that 12/25 frames are less than 4/5 frames, and the liquid crystal panel with the function of driving the overdrive OD can achieve the final desired brightness with less variation time.
It should be noted that, the weight ratio of the difference between the response time and the OD time occupied by the duration of change is not specifically limited, and the above description is only exemplary, and the weight ratio may be set in a specific situation or may be modified manually.
Therefore, when the liquid crystal panel has the function of driving the over-frequency OD, the invention can be used together with the OD function, can further enlarge the range of reducing the response time, can further reduce the change duration on the basis of the OD function, reduces the operation time and improves the calculation speed.
Fig. 9 is a schematic diagram illustrating principles of static backlight control and dynamic backlight control according to an embodiment of the present invention, and as shown in fig. 9, luminance (Luminance) is Luminance of a liquid crystal display panel (LCD) and a backlight moduleThe sum of the brightness values of the Backlight module and the LCD in the static control Backlight is added in one frame time to obtain the brightness of the whole LCD with response time t 1 In the dynamic control backlight, the brightness of the backlight module is decreased in sequence according to the step-shaped change, 4 steps are provided, the brightness of the backlight module and the brightness of the LCD with 4 steps are added to the brightness of the whole liquid crystal display screen within one frame time, and the response time is t 2 ，t 2 Less than t 1 Therefore, the response time can be shortened by dynamically controlling the backlight.
Fig. 10 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 10, the apparatus includes: a first determining module 1001, configured to determine, according to next frame display data corresponding to the liquid crystal panel, a next frame target brightness corresponding to the backlight module; a second determining module 1002, configured to determine, according to the current brightness of the backlight module, an adjusted brightness of the backlight module, where a difference between the adjusted brightness and the current brightness is greater than a difference between the target brightness and the current brightness; and the control module 1003 is configured to control the backlight module to display the adjusted brightness, and gradually change the adjusted brightness into the target brightness.
Optionally, the second determining module 1002 includes a first determining unit and a processing unit;
optionally, the first determining unit is configured to determine a current brightness of the backlight module; when the target brightness is greater than the current brightness, the processing unit is used for adding the target brightness and a positive brightness value to obtain the adjusted brightness; and when the target brightness is smaller than the current brightness, the processing unit is further configured to subtract the positive brightness value from the target brightness to obtain the adjusted brightness.
Optionally, the first determining unit is specifically configured to determine the positive brightness value according to a difference between the target brightness and the current brightness and/or attribute information of the liquid crystal panel.
Optionally, the control module 1003 is specifically configured to control the backlight module to gradually increase or decrease the adjusted brightness to the target brightness according to a step-like change.
Optionally, the control module 1003 includes a second determining unit, a third determining unit and a control unit.
Optionally, the second determining unit is configured to determine a duration of a change from the adjusted brightness to the target brightness and a number of steps; wherein the change duration is less than the duration of one frame of picture; the third determining unit is used for determining the duration and the continuous brightness of each step according to the change duration, the number of steps, the target brightness and the adjusting brightness; and the control unit is used for controlling the backlight module to gradually change the adjusted brightness into the target brightness according to the duration and the continuous brightness of each step.
Optionally, the second determining unit is specifically configured to determine the change duration according to a response time of the liquid crystal panel.
Optionally, if the liquid crystal panel has a function of driving the over frequency OD, the third determining unit is further configured to determine the change duration according to the OD time of the liquid crystal panel.
For a specific implementation principle and beneficial effects of the backlight control device provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
Fig. 11 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 11, the backlight control apparatus may include: at least one processor 1101 and memory 1102;
the memory 1102 stores computer-executable instructions;
the at least one processor 1101 executes the computer-executable instructions stored by the memory 1102 to cause the at least one processor 1101 to perform a method according to any one of the embodiments described above.
For a specific implementation principle and beneficial effects of the backlight control device provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
The embodiment of the present invention further provides a backlight control system, which includes the backlight control device and the backlight module shown in fig. 11; wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
For a specific implementation principle and beneficial effects of the backlight control system provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
An embodiment of the present invention further provides an electronic device, including the backlight control system and the liquid crystal panel described in any of the above embodiments. The backlight control system is used for providing backlight for the liquid crystal panel.
Optionally, the electronic device may be any device provided with an LED, such as a liquid crystal television, and the embodiment of the present invention is not limited thereto.
The structure, function, connection relationship, specific implementation principle, process, and effect of each component in the electronic device provided in this embodiment may be referred to in the foregoing embodiments, and are not described herein again.
The embodiment of the present invention further provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the computer-executable instructions are used to implement the method according to any one of the foregoing embodiments.
Embodiments of the present invention further provide a computer program product, which includes a computer program, and when the computer program is executed by a processor, the computer program implements the method described in any of the foregoing embodiments.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods according to the embodiments of the present invention.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a DIgital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of hardware and software modules.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present invention are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.
Claims (10)
1. A backlight control method, comprising:
determining the target brightness of the next frame corresponding to the backlight module according to the display data of the next frame corresponding to the liquid crystal panel;
determining the adjusted brightness of the backlight module according to the current brightness of the backlight module, wherein the difference value between the adjusted brightness and the current brightness is larger than the difference value between the target brightness and the current brightness;
and controlling the backlight module to display the adjusted brightness, and gradually changing the adjusted brightness into the target brightness.
2. The method of claim 1, wherein determining the adjusted brightness of the backlight module based on the current brightness of the backlight module comprises:
determining the current brightness of the backlight module;
if the target brightness is greater than the current brightness, adding the target brightness and a positive brightness value to obtain the adjusted brightness;
and if the target brightness is smaller than the current brightness, subtracting the positive brightness value from the target brightness to obtain the adjusted brightness.
3. The method of claim 2, wherein determining the current brightness of the backlight module comprises:
and determining the positive brightness value according to the difference value between the target brightness and the current brightness and/or the attribute information of the liquid crystal panel.
4. The method according to claim 1, wherein controlling the backlight module to display the adjusted brightness and gradually change the adjusted brightness to the target brightness comprises:
and controlling the backlight module to gradually increase or decrease from the adjusted brightness to the target brightness according to the step-like change.
5. The method according to claim 4, wherein controlling the backlight module to gradually increase or decrease from the adjusted brightness to the target brightness in a step-like manner comprises:
determining a change duration from the adjusted brightness to the target brightness and a number of steps; wherein the change duration is less than the duration of one frame of picture;
determining the duration and the continuous brightness of each step according to the change duration, the number of steps, the target brightness and the adjusted brightness;
and controlling the backlight module to gradually change the adjusted brightness into the target brightness according to the duration and the continuous brightness of each step.
6. The method of claim 5, wherein determining a duration of the change from the adjusted brightness to the target brightness comprises:
and determining the duration of the change according to the response time of the liquid crystal panel.
7. The method of claim 5 or 6, further comprising:
and if the liquid crystal panel has the function of driving the over-frequency OD, determining the change time according to the OD time of the liquid crystal panel.
8. A backlight control apparatus, comprising: a memory and at least one processor;
the memory stores computer-executable instructions;
execution of the computer-executable instructions stored by the memory by the at least one processor causes the at least one processor to perform the method of any one of claims 1-7.
9. A backlight control system, comprising: the backlight control apparatus and backlight module of claim 8;
wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
10. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, perform the method of any one of claims 1-7.
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| CN115565497A (en) * | 2022-10-28 | 2023-01-03 | 惠科股份有限公司 | Backlight adjusting method, backlight adjusting device, display device and electronic equipment |
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