CN113870804B - Backlight control system, method, device and storage medium - Google Patents
Backlight control system, method, device and storage medium Download PDFInfo
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- CN113870804B CN113870804B CN202111208558.5A CN202111208558A CN113870804B CN 113870804 B CN113870804 B CN 113870804B CN 202111208558 A CN202111208558 A CN 202111208558A CN 113870804 B CN113870804 B CN 113870804B
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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
Abstract
The invention provides a backlight control system, a method, equipment and a storage medium. The system comprises: the backlight data generator is used for determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel; sending the target brightness and the address of the data segment lookup table to an LED driver; the LED driver is used for selecting the data segment corresponding to the address from the plurality of data segments stored in the lookup table in advance, compensating the target brightness of the next frame according to the compensation data of the plurality of stages in the data segment corresponding to the address, determining the display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module according to the display brightness, the data transmitted by each frame of the backlight data generator only needs to comprise the target brightness and the address, and the LED driver acquires the compensation data from the corresponding data segment according to the address, so that the data amount transmitted to the LED driver is reduced, and the accuracy of acquiring the data is improved.
Description
Technical Field
The present invention relates to backlight control technologies, and in particular, to a backlight control system, method, device, and storage medium.
Background
An LCD (Liquid Crystal Display) panel is an electronic device that does not emit light actively, and does not have a light-emitting characteristic, and it needs to rely on a light source in a backlight module to emit light. When the LCD panel displays a picture, the LED (Light-emitting Diode) driver is required to transmit the backlight data of the next frame of image to the mini LED, and the mini LED displays the brightness of the next frame according to the acquired backlight data, so that the corresponding LCD panel can display the corresponding picture.
When the gray-scale value of the backlight module in the LED of one frame of image is dynamically adjusted according to a plurality of levels, the gray-scale value of each level needs to be continuously sent to the LED driver. However, in this case, for continuous data transmission, it is necessary to quickly transmit a plurality of data, and therefore, it is difficult to ensure the accuracy of data transmission.
Disclosure of Invention
The invention provides a backlight control system, a method, equipment and a storage medium, which are used for improving the accuracy of data transmission.
In a first aspect, the present invention provides a backlight control system, the system comprising:
the backlight data generator is used for determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel; sending the target brightness and the address of the data segment in the lookup table to an LED driver;
the LED driver is used for selecting the data segment corresponding to the address from a plurality of data segments stored in a lookup table in advance, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different; compensating the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness.
Optionally, when determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, the backlight data generator is specifically configured to:
determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel;
determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining the address of the data segment in the corresponding lookup table according to the initial compensation data.
Optionally, determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module, and the target brightness, includes:
determining a corresponding time constant according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining initial compensation data of the next frame of the backlight module according to the time constant.
Optionally, the backlight data generator is further configured to: after power-on, sending initial setting data and the lookup table to the LED driver;
the LED driver is further configured to: and initializing according to the initial setting data, and storing the lookup table.
Optionally, when the LED driver compensates the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determines the display brightness corresponding to the multiple stages, and controls the brightness of the backlight module according to the display brightness, the LED driver is specifically configured to:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to increase in a step-like manner or decrease in a step-like manner according to the display brightness until the target brightness is reached;
if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
In a second aspect, the present invention provides a backlight control method applied to a backlight data generator, including:
determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel;
sending the target brightness and the address of the data segment in the lookup table to an LED driver so that the LED driver selects the data segment corresponding to the address from a plurality of data segments stored in the lookup table in advance, compensating the target brightness of the next frame according to the compensation data of a plurality of stages in the data segment corresponding to the address, determining the display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module according to the display brightness; the compensation data of a plurality of stages in one frame are stored in each data segment, the compensation data of the plurality of stages sequentially descend or ascend in a stair-shaped manner, and the compensation data of the same stage in different data segments are different.
Optionally, determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, includes:
determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel;
determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining the address of the data segment in the corresponding lookup table according to the initial compensation data.
Optionally, the method further includes:
after the LED driver is powered on, initial setting data and the query table are sent to the LED driver, so that the LED driver can initialize according to the initial setting data and store the query table.
In a third aspect, the present invention provides a backlight control method applied to an LED driver, including:
acquiring target brightness and an address of a data segment sent by a backlight data generator; the target brightness and the address of the data segment are determined by the backlight data generator according to the display data of the next frame of the liquid crystal panel;
selecting a data segment corresponding to the address from a plurality of data segments pre-stored in a lookup table, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different;
and compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness.
Optionally, compensating the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness, includes:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to be increased in a step-like manner or decreased in a step-like manner according to the display brightness until the target brightness is reached;
if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
In a fourth aspect, the present invention also provides a backlight control apparatus, comprising: a memory and at least one processor;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of any one of the second and third aspects.
In a fifth aspect, the present invention further provides an electronic device, which includes a liquid crystal panel and the system of the first aspect.
In a sixth 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 second and third aspects when executed by a processor.
The invention provides a backlight control system, a method, a device and a storage medium.A backlight data generator is used for determining the target brightness of the next frame of a backlight module and the address of a data segment in a lookup table according to the display data of the next frame of a liquid crystal panel; sending the target brightness and the address of the data segment lookup table to an LED driver; the LED driver is used for selecting the data segment corresponding to the address from a plurality of data segments stored in a lookup table in advance, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different; compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, controlling the brightness of the backlight module according to the display brightness, wherein the data transmitted by each frame of the backlight data generator only needs to comprise the target brightness and the address, and the LED driver acquires the compensation data from the corresponding data segment according to the address, so that the data amount transmitted to the LED driver is reduced, and the accuracy and the reliability of the acquired data are 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. 1 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. 2 is a schematic diagram illustrating a principle of an LED driver controlling light emission of an LED 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. 4 is a schematic diagram of an LED data protocol between a backlight data generator and an LED driver according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a principle of static backlight control and dynamic backlight control according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a backlight control system according to an embodiment of the present invention;
FIG. 7A is a diagram illustrating a relationship between high/low TC and backlight initial compensation data according to an embodiment of the present invention;
FIG. 7B is a schematic diagram illustrating another relationship between high/low TC and backlight initial compensation data according to an LCD panel according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating adjusting the brightness of a backlight LED according to a look-up table according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a new LED data protocol between a backlight data generator and an LED driver according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a backlight control method according to an embodiment of the invention;
fig. 11 is a flowchart illustrating another backlight control method according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another backlight control device according to an embodiment of the present invention;
fig. 14 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 the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with 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. The following description refers to the accompanying drawings in which the same 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 … …" or "at … …" 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 phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The following explains an application scenario provided by an embodiment of the present invention:
the scheme provided by the embodiment of the invention relates to an LCD panel display picture. Fig. 1 is a schematic view of a vertical structure of a local dimming LED backlight LCD panel according to an embodiment of the present invention, as shown in fig. 1, the LCD panel itself does not emit light, and the LEDs emit light, so that when the LCD panel displays a picture, a backlight module composed of a plurality of LEDs on the back provides a light source to enable the LCD panel to display corresponding picture information. The picture information may include image, color, and text, etc. The LEDs may be mini LEDs.
Fig. 2 is a schematic diagram illustrating a principle that an LED Driver controls an LED to emit light according to an embodiment of the present invention, as shown in fig. 2, a current is input to a Backlight Data Generator (Backlight Data Generator), the Backlight Data Generator can be used to generate corresponding LED Backlight Data and send the LED Backlight Data to an LED Driver (LED Driver), and the LED Driver controls the LED according to the obtained LED Backlight Data, so that the LED emits light.
Fig. 3 is a schematic view of an application scenario provided in the embodiment of the present invention. As shown in fig. 3, when a user is watching a tv program, the liquid crystal panel 10 emits light through the backlight module behind the screen, and the user can see the picture information of the liquid crystal panel 10.
Fig. 4 is a schematic diagram of a principle of an LED data protocol between a backlight data generator and an LED driver according to an embodiment of the present invention, as shown in fig. 4, after power is turned on, the backlight data generator sends initial setting data to the LED driver, and initializes data in each LED through the LED driver, where the initial setting data may be set to 0. And sending backlight data corresponding to the target brightness of the next frame of the backlight module to the LED driver in real time, and determining the data of each LED in each frame by the LED driver according to a time axis so as to determine the target brightness of each LED.
Fig. 5 is a schematic diagram illustrating a principle of static Backlight control and dynamic Backlight control according to an embodiment of the present invention, where, as shown in fig. 5, Luminance (Luminance) is Luminance of the LCD panel, which is a sum of Luminance values of the LCD panel and the Backlight module (Backlight), and in the static control Backlight, Luminance of the Backlight module and the LCD panel is added within a frame time, which is Luminance of the LCD panel, and a response time is t1In 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 into the brightness of the liquid crystal display screen within one frame time, and the response time is t2，t2Less than t1Therefore, the response time can be shortened by dynamically controlling the backlight.
In some technologies, in dynamically controlling the backlight, a plurality of levels of backlight data are required in one frame, and for continuous data transmission, data of each stage needs to be continuously sent to the LED driver, and a plurality of data is rapidly transmitted, in which case it is difficult to ensure accuracy of data transmission.
Therefore, the present invention provides a backlight control system, in which a backlight data generator can determine the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, and send the determined address to an LED driver, the LED driver searches the data segment corresponding to the address from the lookup table, and compensates the target brightness of the next frame according to the searched data segment to obtain the display brightness corresponding to a plurality of stages, and controls the brightness of the backlight module according to the display brightness corresponding to the plurality of stages, so that the data protocol transmitted between the backlight data generator and the LED driver is changed relative to the scheme shown in fig. 4, the data transmitted by each frame of the backlight data generator only needs to include the target brightness and the address, the LED driver obtains the compensated data from the corresponding data segment according to the address, and reduces the data amount transmitted to the LED driver, the accuracy and the reliability of the acquired data are improved.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below may be combined with each other without conflict between the embodiments.
Fig. 6 is a schematic structural diagram of a backlight control system according to an embodiment of the present invention, and as shown in fig. 6, the system includes:
the backlight data generator is used for determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel; sending the target brightness and the address of the data segment in the lookup table to an LED driver; the LED driver is used for selecting the data segment corresponding to the address from a plurality of data segments stored in a lookup table in advance, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different; and compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness.
The lookup Table may be a Time Constant lookup Table (TC LUT). The lookup table stores a plurality of data segments in advance, and each address corresponds to one data segment. The target brightness may refer to a brightness required for displaying the display data of the next frame, and the target brightness has a corresponding gray value.
Optionally, the backlight data generator may determine a gray value corresponding to the target brightness of the next frame and an address of a data segment in the lookup table according to the display data of the next frame, and send the gray value corresponding to the target brightness and the address of the data segment to the LED driver. The address is used for the LED driver to determine the compensation data for the next frame.
Specifically, according to the display data of the next frame of the liquid crystal panel, the gray value of each LED in the backlight module in the next frame and the address of the data segment in the lookup table are determined.
Optionally, the LED driver obtains the target brightness and the address of the data segment sent from the backlight data generator, selects the data segment corresponding to the address of the data segment from the lookup table, compensates the gray value corresponding to the target brightness according to the compensation data of multiple stages in the queried data segment, obtains the display brightness corresponding to each stage, and controls the brightness of the backlight module according to the display brightness of each stage.
TABLE 1
| Address | Data segment | |
| Address | Data segment | 1 |
| Address B | Data segment 2 | |
| Address C | Data segment 3 |
In table 1, the addresses in the lookup table correspond to the data segments one to one, and when the LED driver obtains the addresses of the data segments, the corresponding data segments can be queried. For example, if the address of the data segment is address C, the corresponding data segment is data segment 3.
Each data segment stores compensation data of multiple stages in one frame, the compensation data can be positive values or negative values and gradually shows a descending or ascending trend, and the compensation data of the same stage in different data segments are different. For example, the compensation data in segment 1 has three phases, which are +3, +5, +6, respectively, and the compensation data in segment 2 also has three phases of +2, +4, + 6.
Illustratively, the gray value corresponding to the target brightness of the next frame of the backlight module is determined to be 40, the address of the data segment in the lookup table is address B, the data segment corresponding to the address B is data segment 2, and the compensation data in the data segment 2 is +9, +7, +5, then the LED driver determines the gray values corresponding to each stage in the next frame to be 49, 47 and 45, and determines the display brightness corresponding to each stage according to the gray values, and controls the brightness of the backlight module.
The embodiment provides a backlight control system, which comprises a backlight data generator, a data storage unit and a data processing unit, wherein the backlight data generator is used for determining the target brightness of the next frame of a backlight module and the address of a data segment in a lookup table according to the display data of the next frame of a liquid crystal panel; sending the target brightness and the address of the data segment lookup table to an LED driver; the LED driver is used for selecting the data segment corresponding to the address from a plurality of data segments stored in a lookup table in advance, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different; compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, controlling the brightness of the backlight module according to the display brightness, wherein the data transmitted by each frame of the backlight data generator only needs to comprise the target brightness and the address, and the LED driver acquires the compensation data from the corresponding data segment according to the address, so that the data amount transmitted to the LED driver is reduced, and the accuracy and the reliability of the acquired data are improved.
Optionally, when determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, the backlight data generator is specifically configured to: determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel; determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness; and determining the address of the data segment in the corresponding lookup table according to the initial compensation data.
The initial compensation data may refer to the compensation data of the first stage. According to the display data of the next frame of the liquid crystal panel, the gray value corresponding to the next frame of the LEDs in the backlight module can be determined.
Optionally, the initial compensation data of the next frame of the backlight module is determined according to the response time of the liquid crystal panel, and the difference between the gray value corresponding to the current brightness of the backlight module and the gray value corresponding to the target brightness.
Specifically, the longest response time of the liquid crystal panel is determined, the longest response time is divided into 10 levels, the higher the level is, the longer the response time is, and the compensation data corresponding to each level is 2. Setting a plurality of preset thresholds with the distance of 10, 20 and … … respectively, and adding up the compensation data corresponding to each preset threshold by 3, for example, the compensation data with the preset threshold range of 0-10 is 3, and the compensation data with the preset threshold range of 10-20 is 6. And determining respectively corresponding compensation data according to the grade of the response time of the liquid crystal panel and the preset threshold range of the difference value between the gray value corresponding to the current brightness of the backlight module and the gray value corresponding to the target brightness, and adding the compensation data according to the obtained compensation data to obtain the initial compensation data of the next frame of the backlight module.
Illustratively, if the response time of the liquid crystal panel is at the 5 th level, and the range of the difference between the gray-level value corresponding to the current brightness of the backlight module and the gray-level value corresponding to the target brightness is 20-30, the corresponding compensation data is 10 and 9, respectively, and the initial compensation data of the next frame of the backlight module is 19.
Optionally, the initial compensation data and the address of the data segment are in a one-to-one correspondence relationship, and the address of the corresponding data segment may be searched in the lookup table according to the obtained initial compensation data.
In this embodiment, according to the response time characteristic of the liquid crystal panel, the current brightness and the target brightness of the backlight module, the initial compensation data corresponding to the backlight module may be determined, and the address of the corresponding data segment may be determined according to the initial compensation data, so that the initial compensation data and the address of the data segment of the backlight module in the next frame may be accurately obtained, and the accuracy of obtaining the address of the data segment may be improved.
Optionally, determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module, and the target brightness, includes: determining a corresponding time constant according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness; and determining initial compensation data of the next frame of the backlight module according to the time constant.
Fig. 7A is a schematic diagram illustrating a relationship between high/low TC of an LCD panel and backlight initial compensation data according to an embodiment of the present invention, as shown in fig. 7A, a response Time characteristic of a liquid crystal panel is related to a Time Constant (TC) corresponding to the liquid crystal panel, and two curves indicate that the liquid crystal panel is raised from the same current display data to the same target display data, but the rising curves are not completely overlapped due to different response Time characteristics. If the corresponding time constant of the liquid crystal panel is higher, the response time of the liquid crystal panel is t3The initial compensation data of the backlight is high, and if the time constant corresponding to the liquid crystal panel is low, the response time of the liquid crystal panel is t4The initial compensation data of the backlight is low. Wherein, t3Greater than t4。
Fig. 7B is a schematic diagram illustrating another relationship between high/low TC and backlight initial compensation data according to an LCD panel, as shown in fig. 7B, when different target luminances are reached from the same current display luminance, the response time characteristics of the two curves may be the same, but the rising curves do not completely coincide because the reached target luminances are different. If the corresponding time constant of the liquid crystal panel is higher and the reached display data is higher, the response time of the liquid crystal panel is t5If the time constant corresponding to the liquid crystal panel is low and the reached display data is low, the response time of the liquid crystal panel is t6The initial compensation data of the backlight is low. Wherein, t5Greater than t6。
Optionally, when the difference between the gray value corresponding to the current brightness of the backlight module and the gray value corresponding to the target brightness is larger, the initial compensation data of the next frame of the backlight module is larger, and when the difference between the gray value corresponding to the current brightness of the backlight module and the gray value corresponding to the target brightness is smaller, the initial compensation data of the next frame of the backlight module is smaller.
Optionally, the time constant of the backlight module is determined according to the response time of the liquid crystal panel and the difference between the gray value corresponding to the current brightness of the backlight module and the gray value corresponding to the target brightness, and the initial compensation data of the next frame of the backlight module is determined according to the time constant.
In this embodiment, the initial compensation data of the next frame of the backlight module is determined by the time constant, so as to improve the accuracy of obtaining the initial compensation data.
Optionally, the backlight data generator is further configured to: after power-on, sending initial setting data and the lookup table to the LED driver; the LED driver is further configured to: and initializing according to the initial setting data, and storing the lookup table.
The initialization data is data for initialization, may be data set artificially, and may be 0, for example. The LED driver can initialize the LEDs in the backlight module according to the initial setting data, so that the gray values of the LEDs are uniform. The backlight data generator may obtain the look-up table from a storage device such as an eeprom (electrically Erasable Programmable Read Only memory) or a Flash memory.
After the backlight module is powered on, the backlight data generator sends initial setting data and a query table to the LED driver, the LED driver initializes an LED in the backlight module according to the obtained initial setting data, and the addresses of a plurality of data segments in the query table and the data segments corresponding to the addresses of the data segments are stored, so that the backlight data generator and the LED driver can share the same query table.
In this embodiment, after power-on, the initial setting data and the lookup table are sent to the LED driver, so that the LED driver initializes the LEDs in the backlight module, and stores the data segment in the lookup table, thereby reducing the transmission of the data amount of the LED driver and improving the transmission efficiency.
Optionally, when the LED driver compensates the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determines the display brightness corresponding to the multiple stages, and controls the brightness of the backlight module according to the display brightness, the LED driver is specifically configured to:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to be increased in a step-like manner or decreased in a step-like manner according to the display brightness until the target brightness is reached; if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
Optionally, the compensation data of multiple stages in the data segment corresponding to the address are added to the target brightness of the next frame, so as to obtain the display brightness corresponding to the multiple stages, where if the display brightness of the next frame of the liquid crystal panel is brighter than the display brightness of the previous frame, the corresponding display brightness is decreased in a step shape, and correspondingly, if the display brightness of the next frame of the liquid crystal panel is darker than the display brightness of the previous frame, the corresponding display brightness is increased in a step shape until the target brightness is reached.
Illustratively, the compensation data corresponding to a plurality of stages in the next frame can be obtained as-4, -7, -10 according to the data segment corresponding to the address, the compensation data is added to the gray value 60 corresponding to the target brightness of the next frame, so as to obtain gray values 50, 53 and 56 corresponding to the display brightness of the backlight module in the next frame, and the display brightness is increased in a step shape.
Optionally, the compensation data stored in the data segment may be a positive value or a negative value, and when both the positive value and the negative value exist in the compensation data, the gray value corresponding to the target brightness of the next frame may be added to obtain the gray value corresponding to the display brightness of each stage in the next frame. And when only a positive value exists in the compensation data, comparing the current brightness with the target brightness, if the current brightness is less than the target brightness, adding the gray value corresponding to the target brightness of the next frame with the compensation data in the data segment to obtain display data descending in a step shape, and if the current brightness is greater than the target brightness, subtracting the gray value corresponding to the target brightness of the next frame from the compensation data in the data segment to obtain display data ascending in a step shape.
In this embodiment, the gray value corresponding to each stage in the next frame is obtained by adding the compensation data of each stage in the data segment to the gray value corresponding to the target brightness of the next frame, so that the display brightness of each stage in the backlight module of the next frame can be determined, and the control efficiency is improved.
Fig. 8 is a schematic diagram of adjusting the brightness of the backlight LED according to the lookup table, as shown in fig. 8, in the lookup table, the compensation data according to each stage is added to the target brightness in the backlight LED to obtain the display brightness corresponding to the backlight LED in each stage. It can be known from the figure that when the time constant of the LCD panel is high, the compensation data of the corresponding backlight LED in each stage is large, and the obtained luminance of the backlight LED in each stage is large, and when the time constant of the LCD panel is low, the compensation data of the corresponding backlight LED in each stage is small, and the obtained luminance of the backlight LED in each stage is small.
Fig. 9 is a schematic diagram illustrating a principle of a new LED data protocol between a backlight data generator and an LED driver according to an embodiment of the present invention, as shown in fig. 9, after power is turned on, the backlight data generator sends initial setting data and a lookup table to the LED driver, the LED driver initializes a gray level of an LED in a backlight module according to the initial setting data, stores an address corresponding to a data segment in the lookup table, searches for an address of a data segment corresponding to the LED in the backlight module according to the initial compensation data, obtains compensation data corresponding to each stage of the LED in a next frame, and adjusts display brightness of each LED in the next frame according to the compensation data.
In practical applications, the backlight module includes a plurality of LEDs, each LED corresponds to a different target brightness, and one LED driver can control the plurality of LEDs within a frame time, and gradually decrease the LEDs to the target brightness within a frame time range, for example, the frame time is 10ms, the gray-scale value corresponding to the target brightness of LED-0 is 40, and there are three stages 50, 47, and 44, respectively, which decrease in a step shape, and decrease to the target brightness within a 9ms time point. Wherein the target brightness may be determined according to display data of the liquid crystal panel. The plurality of LEDs may be controlled by a plurality of LED drivers, respectively.
By adjusting the multi-stage display brightness of the LEDs in one frame of image, the response time of the display frame of the panel can be shortened, and the experience of watching the display frame by a user is improved.
By using the technical scheme disclosed by the embodiment of the invention, in practical application, after power is on, the backlight data generator reads the lookup table from the storage device and sends the initial setting data and the lookup table to the LED driver, and only needs to transmit the initial setting data and the lookup table to the LED driver once. And then, the backlight data generator sends the target brightness of the next frame and the address of the data segment to the LED driver according to the display data of the next frame, the LED searches corresponding compensation data according to the address of the data segment, adds the compensation data and the gray value corresponding to the target brightness, and displays the gray value corresponding to the brightness in each stage in the next frame to realize staged dynamic control of the LED backlight.
Fig. 10 is a flowchart illustrating a backlight control method according to an embodiment of the present invention. Applied to a backlight data generator, as shown in fig. 10, the method includes:
1001, determining target brightness of a next frame of the backlight module and an address of a data segment in a lookup table according to display data of the next frame of the liquid crystal panel;
Optionally, determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, includes:
determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel;
determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining a corresponding lookup table according to the initial compensation data.
Optionally, the method further includes:
after the LED driver is powered on, initial setting data and the lookup table are sent to the LED driver, so that the LED driver can initialize according to the initial setting data, and addresses of a plurality of data segments in the lookup table are stored.
The specific implementation principle and effect of the method in this embodiment can be found in the foregoing embodiments, and are not described herein again.
Fig. 11 is a flowchart illustrating another backlight control method according to an embodiment of the present invention. Applied to an LED driver, as shown in fig. 11, the method includes:
Optionally, compensating the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness, includes:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to be increased in a step-like manner or decreased in a step-like manner according to the display brightness until the target brightness is reached;
if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
The specific implementation principle and effect of the method in this embodiment can be found in the foregoing embodiments, and are not described herein again.
Fig. 12 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 12, the apparatus includes:
a determining module 1201, configured to determine, according to display data of a next frame of the liquid crystal panel, target brightness of the next frame of the backlight module and an address of a data segment in the lookup table;
a sending module 1202, configured to send the target brightness and an address of a data segment in the lookup table to an LED driver, so that the LED driver selects the data segment corresponding to the address from multiple data segments pre-stored in the lookup table, compensates the target brightness of a next frame according to compensation data of multiple stages in the data segment corresponding to the address, determines display brightness corresponding to the multiple stages, and controls brightness of the backlight module according to the display brightness; the compensation data of a plurality of stages in one frame are stored in each data segment, the compensation data of the plurality of stages sequentially descend or ascend in a stair-shaped manner, and the compensation data of the same stage in different data segments are different.
Optionally, the determining module 1201 is specifically configured to:
determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel;
determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining a corresponding lookup table according to the initial compensation data.
Optionally, the sending module 1202 is further configured to:
after the LED driver is powered on, initial setting data and the lookup table are sent to the LED driver, so that the LED driver can initialize according to the initial setting data, and addresses of a plurality of data segments in the lookup table are stored.
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. 13 is a schematic structural diagram of another backlight control device according to an embodiment of the present invention. As shown in fig. 13, the apparatus includes:
an obtaining module 1301, configured to obtain target brightness and an address of the data segment sent by the backlight data generator; the target brightness and the address of the data segment are the target brightness of the next frame of the backlight module and the address of the data segment in the query table determined by the backlight data generator according to the display data of the next frame of the liquid crystal panel;
a selecting module 1302, configured to select a data segment corresponding to the address from a plurality of data segments pre-stored in a lookup table, where each data segment stores compensation data of multiple stages in a frame, the compensation data of the multiple stages sequentially decrease or increase in a staircase shape, and the compensation data of the same stage in different data segments are different;
and the control module 1303 is configured to compensate the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determine display brightness corresponding to the multiple stages, and control the brightness of the backlight module according to the display brightness.
Optionally, the control module 1303 is specifically configured to:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to be increased in a step-like manner or decreased in a step-like manner according to the display brightness until the target brightness is reached;
if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
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. 14 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 14, the backlight control apparatus may include: memory 142 and at least one processor 141;
the memory 142 stores computer-executable instructions;
the at least one processor 141 executing the computer executable instructions stored by the memory 142 causes the at least one processor 141 to perform a method as in any 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.
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.
An embodiment of the present invention further provides 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 embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical 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 mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, 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 the hardware and software modules within the processor.
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 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. This 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 system, comprising:
the backlight data generator is used for determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel; sending the target brightness and the address of the data segment in the lookup table to an LED driver;
the LED driver is used for selecting the data segment corresponding to the address from a plurality of data segments stored in a lookup table in advance, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different; and compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness.
2. The system of claim 1, wherein the backlight data generator, when determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel, is specifically configured to:
determining the target brightness of the next frame of the backlight module according to the display data of the next frame of the liquid crystal panel;
determining initial compensation data of a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining the address of the data segment in the corresponding lookup table according to the initial compensation data.
3. The system of claim 2, wherein determining initial compensation data for a next frame of the backlight module according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness comprises:
determining a corresponding time constant according to the response time characteristic of the liquid crystal panel, the current brightness of the backlight module and the target brightness;
and determining initial compensation data of the next frame of the backlight module according to the time constant.
4. The system of claim 1,
the backlight data generator is further configured to: after power-on, sending initial setting data and the lookup table to the LED driver;
the LED driver is further configured to: and initializing according to the initial setting data, and storing the lookup table.
5. The system according to claim 1, wherein the LED driver, when compensating the target brightness of the next frame according to the compensation data of multiple stages in the data segment corresponding to the address, determines the display brightness corresponding to the multiple stages, and controls the brightness of the backlight module according to the display brightness, is specifically configured to:
adding compensation data of a plurality of stages in the data section corresponding to the address with target brightness corresponding to the next frame respectively to obtain display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module to be increased in a step-like manner or decreased in a step-like manner according to the display brightness until the target brightness is reached;
if the current brightness is less than the target brightness, the compensation data of the multiple stages are positive, and if the current brightness is greater than the target brightness, the compensation data of the multiple stages are negative.
6. A backlight control method applied to a backlight data generator includes:
determining the target brightness of the next frame of the backlight module and the address of the data segment in the lookup table according to the display data of the next frame of the liquid crystal panel;
sending the target brightness and the address of the data segment in the query table to an LED driver so that the LED driver selects the data segment corresponding to the address from a plurality of data segments stored in the query table in advance, compensating the target brightness of the next frame according to the compensation data of a plurality of stages in the data segment corresponding to the address, determining the display brightness corresponding to the plurality of stages, and controlling the brightness of the backlight module according to the display brightness; the compensation data of a plurality of stages in one frame are stored in each data segment, the compensation data of the plurality of stages sequentially descend or ascend in a stair-shaped manner, and the compensation data of the same stage in different data segments are different.
7. A backlight control method is applied to an LED driver and comprises the following steps:
acquiring target brightness and an address of a data segment sent by a backlight data generator; the target brightness and the address of the data segment are determined by the backlight data generator according to the display data of the next frame of the liquid crystal panel;
selecting a data segment corresponding to the address from a plurality of data segments pre-stored in a lookup table, wherein each data segment stores compensation data of a plurality of stages in a frame, the compensation data of the plurality of stages sequentially descend or ascend in a step shape, and the compensation data of the same stage in different data segments are different;
and compensating the target brightness of the next frame according to the compensation data of the multiple stages in the data segment corresponding to the address, determining the display brightness corresponding to the multiple stages, and controlling the brightness of the backlight module according to the display brightness.
8. A backlight control apparatus, comprising: a memory and at least one processor;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of claim 6 or 7.
9. An electronic device comprising a liquid crystal panel and the system of claim 1.
10. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, perform the method of claim 6 or 7.
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