CN110164385B - Backlight brightness adjusting method - Google Patents

Backlight brightness adjusting method Download PDF

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Publication number
CN110164385B
CN110164385B CN201910472978.0A CN201910472978A CN110164385B CN 110164385 B CN110164385 B CN 110164385B CN 201910472978 A CN201910472978 A CN 201910472978A CN 110164385 B CN110164385 B CN 110164385B
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display
image
brightness
partition
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CN110164385A (en
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杨雁
郑斌义
吴玲
沈柏平
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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
    • 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
    • G09G3/36—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 using liquid crystals
    • 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
    • G09G2320/0613—The adjustment depending on the type of the information to be displayed
    • G09G2320/062—Adjustment of illumination source parameters

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention discloses a method for adjusting the brightness of a backlight source. The backlight brightness adjusting method comprises the following steps: step 1, dividing an image to be input according to a preset partition ruleDividing the liquid crystal display screen into a plurality of display subareas, wherein the image subareas correspond to the display subareas one by one; step 2, determining the target brightness L of the light-emitting elements in the backlight module corresponding to the first display partition1: step 3, obtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea according to the step 21The method of (1) obtains target brightness of light-emitting elements in the backlight module in other display partitions in the liquid crystal display screen; and 4, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness. According to the technical scheme provided by the embodiment of the invention, the contrast ratio of the liquid crystal display screen is improved, and the display effect of the liquid crystal display screen is improved.

Description

Backlight brightness adjusting method
Technical Field
The embodiment of the invention relates to the technical field of backlight brightness adjustment, in particular to a backlight brightness adjusting method.
Background
The high-dynamic range (HDR) display technology can expand the display brightness range of the liquid crystal display screen, so that the liquid crystal display screen can show more details of a bright part and a dark part, and further brings better visual experience to users, and is popular with users.
The DHR display screen comprises a backlight module and a liquid crystal display panel positioned on the light-emitting side of the backlight module, wherein the backlight module usually adopts a direct type structure with a mini LED as a light source, and the brightness of the backlight module is adjusted by respectively controlling the mini LEDs in different partitions. The backlight brightness adjusting method in the prior art is as follows: the brightness information of each partition is obtained after the brightness of the sub-pixels in each partition in the image to be displayed is simply processed, for example, the average brightness of the sub-pixels in each partition is taken as the brightness information of the corresponding partition, and the brightness of the backlight source in the corresponding partition is adjusted accordingly. For the situation that the brightness of most sub-pixels in the partitions is high, the partition brightness information obtained through calculation is high easily due to the mode, the problem that the backlight brightness is turned on too high and then the image is dark and bright appears, the contrast of the liquid crystal display screen is distorted, and the display effect is poor.
Disclosure of Invention
The invention provides a method for adjusting the brightness of a backlight source, which is used for improving the contrast of a liquid crystal display screen and improving the display effect of the liquid crystal display screen.
The embodiment of the invention provides a method for adjusting the brightness of a backlight source, which is applied to a liquid crystal display screen with a direct type backlight module, and comprises the following steps:
step 1, dividing an image to be input into a plurality of image partitions according to a preset partition rule, and dividing the liquid crystal display into a plurality of display partitions, wherein the image partitions correspond to the display partitions one by one, and the display partitions are used for displaying image contents corresponding to the image partitions;
step 2, any image partition in the plurality of image partitions is a first image partition, the display partition corresponding to the first image partition is a first display partition, and the target brightness L of the light-emitting element in the backlight module corresponding to the first display partition is determined according to the following mode1：
Obtaining the total brightness V of all sub-pixels in the first image partition1；
Acquiring the inherent maximum limit brightness V of the first display subarea display imagemax；
Obtaining the inherent maximum opening brightness L of the light-emitting element in the backlight modulemax；
According to the total brightness V of all the sub-pixels1The intrinsic maximum limit brightness VmaxAnd the inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea1；
Step 3, obtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea in the step 21The method of (1), obtain the target luminance of the light-emitting component in the said back light module set in other display subareas in the said liquid crystal display screen;
and 4, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
The technical scheme provided by the embodiment of the invention comprises the steps of dividing an image to be input into a plurality of image subareas, dividing a liquid crystal display screen into a plurality of display subareas, wherein the image subareas correspond to the display subareas one by one, the display subareas are used for displaying the image content of the corresponding image subareas, obtaining the target brightness of the light-emitting element in the backlight module in each display subarea according to the total brightness of all sub-pixels in each image subarea, the inherent maximum limit brightness of the image displayed by each display subarea and the inherent maximum starting brightness of the light-emitting element in the backlight module, adjusting the light-emitting element corresponding to each display subarea in the liquid crystal display screen to the corresponding target brightness, comprehensively determining the target brightness of the light-emitting element in the backlight module based on the inherent parameters of the liquid crystal display screen and the display content of the image to be input, and reducing the probability of the occurrence of the problem of dark, the contrast ratio of the liquid crystal display screen is improved, and the display effect of the liquid crystal display screen is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic flowchart of a method for adjusting luminance of a backlight according to an embodiment of the present invention;
fig. 2 is a diagram illustrating an embodiment of determining a target luminance L of a light emitting device in a backlight module corresponding to a first display partition1A schematic flow diagram of the method of (1);
fig. 3 is a schematic structural diagram of an image to be input according to an embodiment of the present invention;
FIG. 4 is a diagram for obtaining the total luminance V of all sub-pixels in the first image partition according to an embodiment of the present invention1A schematic flow diagram of the method of (1);
FIG. 5 is a diagram illustrating a luminance distribution of a first image partition according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments, structures, features and effects of a backlight brightness adjusting method according to the present invention with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a method for adjusting the brightness of a backlight source, which is applied to a liquid crystal display screen with a direct type backlight module, and comprises the following steps:
step 1, dividing an image to be input into a plurality of image partitions according to a preset partition rule, and dividing the liquid crystal display into a plurality of display partitions, wherein the image partitions correspond to the display partitions one by one, and the display partitions are used for displaying image contents corresponding to the image partitions;
step 2, any image partition in the plurality of image partitions is a first image partition, the display partition corresponding to the first image partition is a first display partition, and the target brightness L of the light-emitting element in the backlight module corresponding to the first display partition is determined according to the following mode1：
Obtaining the total brightness V of all sub-pixels in the first image partition1；
Acquiring the inherent maximum limit brightness V of the first display subarea display imagemax；
Obtaining the inherent maximum opening brightness L of the light-emitting element in the backlight modulemax；
According to the total brightness V of all the sub-pixels1The intrinsic maximum limit brightness VmaxAnd the inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea1；
Step 3, obtaining the pair of the first display subareas according to the step 2Target brightness L of light-emitting element in backlight module1The method of (1), obtain the target luminance of the light-emitting component in the said back light module set in other display subareas in the said liquid crystal display screen;
and 4, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
The technical scheme provided by the embodiment of the invention comprises the steps of dividing an image to be input into a plurality of image subareas, dividing a liquid crystal display screen into a plurality of display subareas, wherein the image subareas correspond to the display subareas one by one, the display subareas are used for displaying the image content of the corresponding image subareas, obtaining the target brightness of the light-emitting element in the backlight module in each display subarea according to the total brightness of all sub-pixels in each image subarea, the inherent maximum limit brightness of the image displayed by each display subarea and the inherent maximum starting brightness of the light-emitting element in the backlight module, adjusting the light-emitting element corresponding to each display subarea in the liquid crystal display screen to the corresponding target brightness, comprehensively determining the target brightness of the light-emitting element in the backlight module based on the inherent parameters of the liquid crystal display screen and the display content of the image to be input, and reducing the probability of the occurrence of the problem of dark, the contrast ratio of the liquid crystal display screen is improved, and the display effect of the liquid crystal display screen is improved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 1 is a schematic flowchart of a method for adjusting luminance of a backlight according to an embodiment of the present invention. The method for adjusting the brightness of the light source provided by this embodiment is applied to a liquid crystal display having a direct-type backlight module, where the backlight source of the direct-type backlight module is a plurality of light emitting elements mounted on the same surface of a substrate, and the light emitting elements may be, for example, LEDs, mini LEDs, micro LEDs, and the like.
As shown in fig. 1, the method for adjusting the brightness of the backlight specifically includes the following steps:
the method comprises the following steps of 1, dividing an image to be input into a plurality of image partitions according to a preset partition rule, dividing a liquid crystal display into a plurality of display partitions, wherein the image partitions correspond to the display partitions one to one, and the display partitions are used for displaying image contents of the corresponding image partitions.
The preset partition rule can be various setting rules, which are specifically limited in this embodiment, and the operator can set and apply the appropriate partition rule according to actual needs.
It should be noted that the liquid crystal display panel includes a backlight module and a liquid crystal display panel located at the light exit side of the backlight module, and the display partition includes a corresponding backlight module portion and a corresponding liquid crystal display panel portion.
It should be noted that the lcd panel includes a plurality of sub-pixels, each of which is a minimum light-emitting unit, and the size of the sub-pixel is small and limited by process limitations, and the size of the light-emitting elements, such as mini LEDs, is relatively large, so that the light-emitting elements do not correspond to the sub-pixels one by one, and each of the light-emitting elements serves as a light source for the plurality of sub-pixels. It can be understood that the number of light emitting elements in the backlight module in each display sub-area is less than the number of sub-pixels in the display sub-area and the number of sub-pixels in the corresponding image sub-area.
Step 2, any image partition in the plurality of image partitions is a first image partition, a display partition corresponding to the first image partition is a first display partition, and the target brightness L of a light-emitting element in the backlight module corresponding to the first display partition is determined1。
Note that the target luminance L1Refers to the expected luminance of the individual light-emitting elements within the first display sub-section.
It should be further noted that, in this embodiment, the number, arrangement manner, and size of the image partition and the display partition are not specifically limited, and the operator can perform reasonable setting according to actual needs.
Specifically, fig. 2 is a diagram illustrating an embodiment of determining a target luminance L of a light emitting device in a backlight module corresponding to a first display partition1Schematic flow chart of the method of (1). As shown in FIG. 2, the target brightness L of the light-emitting elements in the backlight module corresponding to the first display partition is determined1The method specifically comprises the following steps:
step 11, obtaining the total brightness V of all sub-pixels in the first image partition1。
The total amount V is1For the total brightness of all sub-pixels in the first image partition, fig. 3 is a schematic structural diagram of an image to be input according to an embodiment of the present invention. As shown in fig. 3, an image to be input is divided into a plurality of image partitions 100, the plurality of image partitions 100 are arranged in a matrix, and the plurality of image partitions 100 include a first image partition 110. With continued reference to fig. 3, the first image partition 110 includes a first sub-pixel 101, a second sub-pixel 102, a third sub-pixel 103, and a fourth sub-pixel 104, the first sub-pixel 101 having a luminance a, the second sub-pixelA luminance b of 102, a luminance c of the third sub-pixel 103 and a luminance d of the fourth sub-pixel 104, the total luminance V of all sub-pixels in the first image partition 1101＝a+b+c+d。
Step 12, obtaining the inherent maximum limit brightness V of the display image of the first display subareamax。
Note that the inherent maximum limit luminance V of the first display division display imagemaxThe sum of the maximum limit luminances when the sub-pixels in the first display sub-area display images, specifically, the maximum limit luminance when the sub-pixels display images is the luminance corresponding to 255 gray levels, that is, the luminance when the sub-pixels display white images. Illustratively, the number of sub-pixels in the first display partition is 4, and the luminance of the sub-pixel when displaying a white picture is P, then the inherent maximum limit luminance V of the image displayed by the first display partition ismax＝4×P。
Step 13, obtaining the inherent maximum opening brightness L of the light-emitting element in the backlight modulemax。
It should be noted that the inherent maximum on-luminance L of the light emitting elements in the backlight modulemaxIs the luminance of a single light-emitting element at its rated current. Illustratively, the rated current of the light emitting element in the backlight module is 2mA, and the inherent maximum on-luminance L of the light emitting element in the backlight modulemaxI.e. the brightness of the light emitting element operating at a current of 2 mA.
Step 14, according to the total brightness V of all sub-pixels1Intrinsic maximum limit brightness VmaxAnd inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display partition1。
Step 3, obtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea according to the step 21The method of (1) obtains target brightness of light emitting elements in the backlight module in other display partitions in the liquid crystal display.
And 4, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
The technical solution provided by this embodiment is to divide the image to be input into a plurality of image partitions, divide the liquid crystal display into a plurality of display partitions, where the image partitions correspond to the display partitions one by one, and the display partitions are used to display the image content of the corresponding image partition, obtain the target brightness of the light-emitting element in the backlight module in each display partition according to the total brightness of all sub-pixels in each image partition, the inherent maximum limit brightness of the image displayed by each display partition, and the inherent maximum on brightness of the light-emitting element in the backlight module, adjust the light-emitting element corresponding to each display partition in the liquid crystal display to the corresponding target brightness, so that the target brightness of the light-emitting element in the backlight module can be comprehensively determined based on the inherent parameters of the liquid crystal display and the display content of the image to be input, and reduce the probability of occurrence of the problem of dark-state partial brightness of the display screen due to, the contrast ratio of the liquid crystal display screen is improved, and the display effect of the liquid crystal display screen is improved.
Illustratively, the total brightness V according to all sub-pixels1Intrinsic maximum limit brightness VmaxAnd inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display partition1Comprises, according to formula V1/Vmax＝L1/LmaxCalculating to obtain the target brightness L of the light-emitting elements in the backlight module corresponding to the first display partition1。
It should be noted that such an arrangement makes the target luminance of the light emitting element based on the image to be input and the intrinsic parameter V of the liquid crystal display panelmaxAnd LmaxThe obtained target brightness is properly adjusted within the displayable range of the liquid crystal display screen due to the participation of the inherent parameters of the liquid crystal display screen instead of simply obtained after the brightness information of the image to be input is simply calculated, so that the probability of the problem of overhigh backlight brightness opening is reduced, and the display effect of the liquid crystal display screen is favorably improved.
Alternatively, fig. 4 is a flowchart for acquiring the total luminance V of all sub-pixels in the first image partition according to an embodiment of the present invention1Schematic flow chart of the method of (1). As shown in fig. 4Obtaining the total brightness V of all sub-pixels in the first image partition1The method specifically comprises the following steps:
and 21, establishing a three-dimensional rectangular coordinate system, wherein the X axis and the Y axis of the three-dimensional rectangular coordinate system are position coordinate axes of sub-pixels in the image to be input, and the Z axis of the three-dimensional rectangular coordinate system is a brightness coordinate axis of the sub-pixels.
It should be noted that the image to be input is a two-dimensional graph, the position of a sub-pixel in the image to be input can be determined by a specific position on the X axis and the Y axis perpendicular to each other, and for example, the position of the geometric center of the sub-pixel can be taken as the position of the sub-pixel.
And step 22, drawing the brightness distribution of each sub-pixel in the first image partition in a three-dimensional rectangular coordinate system.
Fig. 5 is a schematic diagram of a luminance distribution of a first image partition according to an embodiment of the present invention. Illustratively, the specific process of obtaining the brightness distribution is as follows: establishing a two-dimensional rectangular coordinate system by taking a certain point in the first image partition as an origin, and determining the coordinates of the geometric center of each sub-pixel in the first image partition in the two-dimensional rectangular coordinate system; and establishing a three-dimensional rectangular coordinate system, and calibrating points corresponding to the sub-pixels in the three-dimensional rectangular coordinate system based on the coordinates of the geometric centers of the sub-pixels in the first image partition in the two-dimensional rectangular coordinate system and the brightness of the sub-pixels to form a brightness distribution schematic diagram as shown in fig. 5. Specifically, the coordinates of the X axis and the Y axis in the three-dimensional rectangular coordinate system correspond to the coordinates in the two-dimensional rectangular coordinate system, and the Z axis is the luminance of the sub-pixel.
For example, the first image partition may be a rectangle, and the coordinates of the sub-pixels at any corner of the first image partition in the three-dimensional rectangular coordinate system and the Y coordinate may be 0. Namely, the geometric center of the sub-pixel at the vertex angle of the rectangular first image partition is located at the origin of the two-dimensional rectangular coordinate system, and the X axis and the Y axis of the two-dimensional rectangular coordinate system are respectively parallel to two adjacent edges of the rectangular first image partition. For example, the luminance distribution shown in fig. 5 may be a luminance distribution of a rectangular first image partition, and as shown in fig. 5, the luminance of the sub-pixels of the middle area of the first image is greater than 0, and the luminance of the sub-pixels of the peripheral area is 0, so that the luminance distribution in fig. 5 forms a graph that appears to include only the luminance of the middle area. It can be understood that each sub-pixel corresponds to a point in the three-dimensional rectangular coordinate system, and in actual production, the size of the sub-pixel is small, so that the number of sub-pixels in each image partition is large, and the obtained brightness distribution is connected into a planar structure.
It should be noted that such an arrangement is beneficial to simplifying the establishment process of the two-dimensional rectangular coordinate system, and makes the coordinates of the sub-pixels simpler, thereby reducing the difficulty of integral calculation of the brightness distribution in the three-dimensional rectangular coordinate system.
Step 23, integrating the brightness distribution to obtain the total brightness V of all sub-pixels in the first image partition1。
It should be noted that the total luminance V can be obtained by simplified calculation by integrating the luminance distribution1Reducing the total brightness V obtained for all sub-pixels in the first image partition1The difficulty of (2).
Fig. 6 is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present invention. As shown in fig. 6, the plurality of light emitting elements 201 in the backlight module are uniformly distributed, the total number of the light emitting elements 201 in the backlight module is m, the total number of the sub-pixels 202 in the liquid crystal display screen is n, the number q of the sub-pixels 202 corresponding to each light emitting element 201 is n/m, and the number of the sub-pixels 202 in the image partition and the display partition 200 is an integral multiple of q.
Specifically, as shown in fig. 6, m is 18, n is 36, q is 2, the number of sub-pixels 202 in the display section 200 is 4, and 4 is 2 times 2.
It should be noted that, with such an arrangement, each sub-pixel can be located in the same display partition with the corresponding light-emitting element, and then the problem that the display effect of the liquid crystal display screen is greatly different from the expected result after the corresponding light-emitting element is lighted according to the brightness information of the image to be input due to the fact that the brightness of the sub-pixel is adjusted by the light-emitting element in the adjacent display partition does not occur, which is beneficial to the improvement of the display effect of the liquid crystal display screen.
For example, the total number of sub-pixels in the image partition and the display partition may range from 1000 to 15000.
It should be noted that, the excessive number of the sub-pixels in the image partition and the display partition causes the light-emitting elements in the backlight module in a large range to be driven by the same parameters, which is not favorable for detail display of the image, the too small number of the sub-pixels in the image partition and the display partition increases the power consumption of the liquid crystal display screen, and when the total number of the sub-pixels in the image partition and the display partition takes a value in the above numerical range, the image detail display effect of the liquid crystal display screen is good, and the power consumption is proper.
Optionally, the rated current of the light emitting element can be set to 0.4 to 3 mA.
It should be noted that, too large rated current of the light emitting element may increase power consumption of the liquid crystal display, too small rated current of the light emitting element may not achieve large display brightness, which is not favorable for increasing the brightness range.
Optionally, adjusting the light emitting elements corresponding to the display partitions in the liquid crystal display screen to the corresponding target brightness may include: and sequentially adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness in a progressive scanning mode.
For example, fig. 7 is a schematic structural diagram of a liquid crystal display screen according to an embodiment of the present invention. As shown in fig. 7, the liquid crystal display panel includes 9 display sections 200 of 3 rows and 3 columns, and the progressive scanning means scanning three display sections 200 in a first row 301, three display sections 200 in a second row 302 and three display sections 200 in a third row 303 in sequence along a first direction F.
It should be noted that, this arrangement makes the power consumption of the liquid crystal display panel at one time point lower by lighting only the light emitting elements in one display section 200 at a time.
Optionally, adjusting the light emitting elements corresponding to the display partitions in the liquid crystal display screen to the corresponding target brightness may include: and simultaneously, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
With continued reference to fig. 7, adjusting the light emitting elements in each display sub-area 200 of the lcd panel to the corresponding target brightness simultaneously means: and simultaneously adjusting the 9 display subareas 200 in the liquid crystal display screen to the corresponding target brightness, wherein the luminous elements in all the display subareas 200 are simultaneously lightened without the sequence.
It should be noted that, such an arrangement can accelerate the total lighting speed of the light emitting elements in the backlight module, which is beneficial to fast update of the display screen.
Optionally, the target brightness L of the light emitting elements in the backlight module corresponding to the first display partition is determined as follows1The method can also comprise the following steps: and judging whether the plurality of image partitions comprise image partitions with the brightness of 0, if so, adjusting the brightness of the light-emitting elements in the display partitions corresponding to the image partitions with the brightness of 0 to be 0, taking the rest image partitions as a plurality of new image partitions, and continuing to execute the step 2, otherwise, continuing to execute the step 2.
Illustratively, with continued reference to FIG. 3, a target luminance L for the light-emitting elements within the backlight assembly in the first display sub-section 110 is determined1Previously, it is determined that the luminance of the first image partition 110 is 0, that is, the luminance of each sub-pixel in the first image partition 110 is 0, at this time, the luminance of the light emitting element in the display partition corresponding to the first image partition 110 is adjusted to 0, and step 2 is performed with the remaining 7 image partitions 100 as the processing objects of the subsequent steps, that is, as the new plurality of image partitions 100, and the plurality of image partitions 100 in step 2 means the remaining 7 image partitions 100.
It should be noted that, such an arrangement enables the light emitting elements in the display sub-area corresponding to the fully dark image sub-area to be directly turned off before the calculation is performed, and subsequent calculation is not required, so that the calculation amount of the subsequent calculation is reduced, and the simplification of the brightness adjustment process is facilitated.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method for adjusting the brightness of a backlight source is applied to a liquid crystal display screen with a direct type backlight module, and comprises the following steps:
step 1, dividing an image to be input into a plurality of image partitions according to a preset partition rule, and dividing the liquid crystal display into a plurality of display partitions, wherein the image partitions correspond to the display partitions one by one, and the display partitions are used for displaying image contents corresponding to the image partitions;
step 2, any image partition in the plurality of image partitions is a first image partition, the display partition corresponding to the first image partition is a first display partition, and the target brightness L of the light-emitting element in the backlight module corresponding to the first display partition is determined according to the following mode1：
Obtaining the total brightness V of all sub-pixels in the first image partition1；
Acquiring the inherent maximum limit brightness V of the first display subarea display imagemax；
Obtaining the inherent maximum opening brightness L of the light-emitting element in the backlight modulemax；
According to the total brightness V of all the sub-pixels1The intrinsic maximum limit brightness VmaxAnd the inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea1；
Step 3, obtaining the light emitting elements in the backlight module corresponding to the first display subarea according to the step 2Target luminance L1The method of (1), obtain the target luminance of the light-emitting component in the said back light module set in other display subareas in the said liquid crystal display screen;
and 4, adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
2. The method according to claim 1, wherein said adjusting is performed according to a total luminance V of all sub-pixels1The intrinsic maximum limit brightness VmaxAnd the inherent maximum on-luminance LmaxObtaining the target brightness L of the light-emitting element in the backlight module corresponding to the first display subarea1The method comprises the following steps:
according to formula V1/Vmax＝L1/LmaxAnd calculating to obtain the target brightness L of the light-emitting elements in the backlight module corresponding to the first display subarea1。
3. Adjustment method according to claim 1, characterized in that said obtaining of the total luminance V of all sub-pixels in said first image partition1The method comprises the following steps:
establishing a three-dimensional rectangular coordinate system, wherein an X axis and a Y axis of the three-dimensional rectangular coordinate system are position coordinate axes of the sub-pixels in the image to be input, and a Z axis of the three-dimensional rectangular coordinate system is a brightness coordinate axis of the sub-pixels;
drawing the brightness distribution of each sub-pixel in the first image partition in the three-dimensional rectangular coordinate system;
integrating the brightness distribution to obtain the total brightness V of all the sub-pixels in the first image partition1。
4. The adjustment method according to claim 3, wherein the first image partition is rectangular, and the X-coordinate and the Y-coordinate of the sub-pixel at any corner of the first image partition in the three-dimensional rectangular coordinate system are 0.
5. The adjusting method according to claim 1, wherein the plurality of light emitting elements in the backlight module are uniformly distributed, the total number of the light emitting elements in the backlight module is m, the total number of the sub-pixels in the liquid crystal display is n, the number q of the sub-pixels corresponding to each light emitting element is n/m, and the number of the sub-pixels in the image partition and the display partition is an integer multiple of q.
6. The adjustment method according to claim 1, wherein the total number of the sub-pixels in the image partition and the display partition ranges from 1000 to 15000.
7. The adjusting method according to claim 1, wherein the rated current of the light emitting element is set to a value in a range of 0.4 to 3 mA.
8. The adjusting method according to claim 1, wherein the adjusting the light emitting elements corresponding to the display sections in the liquid crystal display panel to the corresponding target brightness comprises:
and sequentially adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness in a progressive scanning mode.
9. The adjusting method according to claim 1, wherein the adjusting the light emitting elements corresponding to the display sections in the liquid crystal display panel to the corresponding target brightness comprises:
and adjusting the light-emitting elements corresponding to the display subareas in the liquid crystal display screen to the corresponding target brightness.
10. The adjusting method according to claim 1, wherein the target brightness of the light emitting elements in the backlight module corresponding to the first display partition is determined as followsL1The method also comprises the following steps:
judging whether the image partitions comprise the image partition with the brightness of 0, if so, adjusting the brightness of a light-emitting element in the display partition corresponding to the image partition with the brightness of 0 to be 0, and taking the rest image partitions as new image partitions to continue to execute the step 2; if not, continuing to execute the step 2.
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