CN111341275A - Display control method, display device and storage medium - Google Patents

Display control method, display device and storage medium Download PDF

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Publication number
CN111341275A
CN111341275A CN201911423023.2A CN201911423023A CN111341275A CN 111341275 A CN111341275 A CN 111341275A CN 201911423023 A CN201911423023 A CN 201911423023A CN 111341275 A CN111341275 A CN 111341275A
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backlight
display
brightness value
value
backlight partition
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CN201911423023.2A
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林智远
谢相伟
闫晓林
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TCL Corp
TCL Research America Inc
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TCL Research America Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention is applicable to the technical field of display, and provides a display control method, a display device and a storage medium. The embodiment of the invention provides a display control method applied to a display device, and the display control method comprises the steps of obtaining display parameters of a backlight unit of the display device according to initial display parameters of a current frame image; calculating display parameters of a display unit of the display device according to the display parameters of the backlight unit; driving the backlight unit to emit light based on the display parameters of the backlight unit; the display unit is driven to display the current frame image based on the display parameters of the display unit, dynamic backlight driving is carried out on the display device by using different display parameters respectively, image display is carried out, the dynamic driving effect is good, and the display effect is improved.

Description

Display control method, display device and storage medium
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display control method, a display device and a storage medium.
Background
With the continuous development of display technology, various types of display devices are developed, which brings great convenience to daily production and life of people. The liquid crystal display device generally comprises a screen driving board, a backlight structure and a liquid crystal panel, when a picture is required to be displayed, the screen driving board drives the backlight structure to emit light according to input image data, a light source is provided for the liquid crystal panel, and in order to reduce power consumption and improve contrast, a dynamic backlight driving method can be adopted to drive the backlight structure.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display control method, a display device, and a storage medium, which respectively use different display parameters to perform dynamic backlight driving on the display device and perform image display, so that the dynamic driving effect is better and the display effect is improved.
A first aspect of an embodiment of the present invention provides a display control method, where the display control method is applied to a display device, where the display device includes a backlight unit and a display unit, and includes:
acquiring display parameters of the backlight unit according to the initial display parameters of the current frame image;
calculating display parameters of the display unit according to the display parameters of the backlight unit;
driving the backlight unit to emit light based on the display parameters of the backlight unit;
and driving the display unit to display the current frame image based on the display parameters of the display unit.
A second aspect of an embodiment of the present invention provides a display apparatus, including a backlight unit, a display unit, a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the display control method according to the first aspect of an embodiment of the present invention when executing the computer program.
A third aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the display control method according to the first aspect of embodiments of the present invention
The embodiment of the invention provides a display control method applied to a display device, and the display control method comprises the steps of obtaining display parameters of a backlight unit of the display device according to initial display parameters of a current frame image; calculating display parameters of a display unit of the display device according to the display parameters of the backlight unit; driving the backlight unit to emit light based on the display parameters of the backlight unit; the display unit is driven to display the current frame image based on the display parameters of the display unit, dynamic backlight driving is carried out on the display device by using different display parameters respectively, image display is carried out, the dynamic driving effect is good, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a first flowchart of a display control method according to an embodiment of the present invention;
FIG. 2 is a second flowchart of a display control method according to an embodiment of the present invention;
FIG. 3 is a third flowchart illustrating a display control method according to an embodiment of the invention;
FIG. 4 is a fourth flowchart illustrating a display control method according to an embodiment of the present invention;
FIG. 5 is a fifth flowchart illustrating a display control method according to an embodiment of the present invention;
fig. 6 is a sixth flowchart illustrating a display control method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
The embodiment provides a display control method, which is applied to a display device, wherein the display device comprises a backlight unit and a display unit, and the display control method is used for performing dynamic backlight driving on the backlight unit and controlling the display unit to display an image. The display control method may be specifically executed by a processor of the display apparatus.
In Application, the Processor may be a screen driver board (TCON), a Central Processing Unit (CPU), or other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
As shown in fig. 1, the display control method provided in this embodiment includes:
and step S101, acquiring the display parameters of the backlight unit according to the initial display parameters of the current frame image.
In application, the current frame image refers to a frame image to be displayed by the display device driving the display unit. The display parameters include gray scale values or brightness values, correspondingly, the initial display parameters of the current frame image include initial gray scale values or initial brightness values of each pixel point in the current frame image, and the display parameters of the backlight unit include gray scale values or brightness values when each backlight partition in the backlight unit is lighted.
In one embodiment, the backlight unit comprises a plurality of backlight partitions with consistent structures, and the display unit comprises a plurality of pixel regions, wherein each pixel region corresponds to one backlight partition.
In application, the number of the backlight partitions included in the backlight unit is the same as the number of the pixel regions included in the display unit, and the backlight unit may be divided into a certain number of backlight partitions according to actual needs, and the display unit may be divided into a corresponding number of pixel regions.
In one embodiment, step S101 is preceded by:
and dividing the display unit into a plurality of pixel areas which are not overlapped with each other according to the position of each backlight partition in the backlight unit.
In application, the display unit may be divided into a plurality of pixel regions that do not overlap with each other with an interval region between adjacent backlight partitions in the backlight unit as a dividing position. The backlight unit comprises a plurality of light-emitting sources, the number of the light-emitting sources included in the backlight unit can be set according to actual needs, the light-emitting sources can be monochrome light-emitting sources or bicolor light-emitting sources, and the bicolor light-emitting sources refer to light-emitting sources capable of emitting light rays of two colors. Each backlight partition may include at least one light emitting source.
In application, when the display device inputs one frame of image, the display parameters of each backlight partition in the backlight unit can be calculated according to the initial display parameters of the current frame of image input by the display device, and the display parameters of the backlight unit comprise the display parameters of all the backlight partitions in the backlight unit. Specifically, the maximum display parameter of the pixel region corresponding to the backlight partition in the current frame image may be assigned to the backlight partition as the display parameter of the backlight partition. When the backlight partition is a monochromatic light source, the maximum display parameters of the pixel region under the current frame image are the maximum values of the initial display parameters of the three color channels of R (Red), G (Green ) and B (Blue ) of all the pixel points corresponding to the pixel region in the current frame image, and the maximum values are the same value. When the backlight is divided into two-color light-emitting sources consisting of a first light-emitting source with a first color and a second light-emitting source with a second color, the maximum display parameter of the pixel region under the current frame image is the maximum value of the initial display parameters of the first color channel and the initial display parameters of the second color channel of all pixel points corresponding to the pixel region in the current frame image, and the maximum value is the same value. The first color and the second color may be any two of R, G, B. When the backlight partition comprises the R light emitting source, the B light emitting source and the G light emitting source, the maximum display parameters of the pixel region under the current frame image include three values, namely, a maximum value in the initial display parameters of the R color channels, a maximum value in the initial display parameters of the G color channels and a maximum value in the initial display parameters of the B color channels of all the pixel points corresponding to the pixel region in the current frame image.
And step S102, calculating the display parameters of the display unit according to the display parameters of the backlight unit.
In application, the display parameters of the display unit include gray-scale values or luminance values of all pixel regions in the display unit. Each pixel region may include at least one pixel point.
Step S103, driving the backlight unit to emit light based on the display parameters of the backlight unit;
and step S104, driving the display unit to display the current frame image based on the display parameters of the display unit.
In application, after obtaining the display parameters of the backlight unit and the display parameters of the display unit, the backlight unit and the display unit are respectively driven according to the display parameters of the display unit of the backlight unit. The display device adopts the display control method provided by the embodiment to dynamically drive the backlight unit to emit light and drive the display unit to display each frame image when the backlight unit emits light for each frame image input by the display device.
The embodiment corresponding to fig. 1 obtains the display parameters of the backlight unit of the display device according to the initial display parameters of the current frame image by providing a display control method applied to the display device; calculating display parameters of a display unit of the display device according to the display parameters of the backlight unit; driving the backlight unit to emit light based on the display parameters of the backlight unit; the display unit is driven to display the current frame image based on the display parameters of the display unit, dynamic backlight driving is carried out on the display device by using different display parameters respectively, image display is carried out, the dynamic driving effect is good, and the display effect is improved.
As shown in fig. 2, in one embodiment, step S101 includes:
step S201, for each backlight partition, obtaining a maximum gray-scale value of a pixel region corresponding to the backlight partition in a current frame image, and assigning the maximum gray-scale value to the backlight partition to obtain a display parameter of the backlight partition.
In application, the display parameters of the backlight partition are different according to the difference of the colors and the number of the luminous sources of the backlight partition. The maximum gray-scale value of the pixel region under the current frame image is obtained according to the initial display parameters of R, G, B color channels of all pixel points corresponding to the pixel region in the current frame image.
In one embodiment, when the backlight partition is a monochrome emission light source, step S201 includes:
for each backlight subarea, acquiring a gray-scale value of each pixel point in a pixel area corresponding to the backlight subarea;
and selecting the obtained maximum gray-scale value, and assigning the selected maximum gray-scale value to the backlight subarea to obtain the display parameters of the backlight subarea.
In application, the gray scale value of each pixel point in the pixel region is the initial gray scale value of R, G, B color channels of each pixel point corresponding to the pixel region in the current frame image. When the backlight partition is a monochromatic light source, selecting a maximum gray-scale value from gray-scale values of each pixel point in a pixel region corresponding to the backlight partition, namely selecting a maximum initial gray-scale value from initial gray-scale values of R, G, B color channels of each pixel point corresponding to the pixel region in the current frame image, and assigning the selected maximum gray-scale value (maximum initial gray-scale value) to the backlight partition, namely obtaining the display parameters of the backlight partition. And similarly, the display parameters of all backlight partitions in the backlight unit can be obtained, so that the display parameters of the backlight unit can be obtained.
As shown in fig. 2, in one embodiment, after step S201, the method includes:
step S202, comparing the brightness value of the backlight partition in the previous frame with the brightness value of the current frame, and adjusting the brightness value of the current frame based on the comparison result;
step S203, updating the display parameter based on the adjusted brightness value to obtain the adjusted display parameter of the backlight partition.
In application, after the gray-scale value of each backlight partition in the current frame is obtained in step S201, the luminance value of each backlight partition in the current frame may be obtained according to a conversion formula of the gray-scale value and the luminance value, and similarly, for the previous frame image, the luminance value of each backlight area in the previous frame may be obtained by using the method provided in the embodiment corresponding to fig. 1 and fig. 2.
In one embodiment, step S202 includes:
calculating the difference value between the brightness value of the previous frame and the brightness value of the current frame of the backlight partition to obtain the brightness value variation of the previous frame and the current frame of the backlight partition;
and if the absolute value of the brightness value variation of the backlight partition in the previous frame and the current frame is greater than the first preset threshold corresponding to the previous frame image, correcting the brightness value of the backlight partition in the current frame to ensure that the absolute value of the brightness value variation of the backlight partition in the previous frame and the current frame is less than or equal to the first preset threshold corresponding to the previous frame image.
In application, the comparison result in step S202 is the variation of the brightness values of the backlight partition in the previous frame and the current frame, and when the absolute value of the comparison result is greater than the first preset threshold corresponding to the image of the previous frame, the brightness value of the backlight partition in the current frame is adjusted, that is, the brightness value of the backlight partition in the current frame is modified, so that the absolute value of the comparison result is less than or equal to the first preset threshold corresponding to the previous frame. The first preset threshold corresponding to the previous frame of image may be set according to actual needs.
In one embodiment, when the backlight is partitioned into two-color light-emitting sources consisting of a first light-emitting source and a second light-emitting source, step S202 includes:
comparing the first brightness value of the backlight partition in the current frame with the first brightness value of the previous frame, and if the difference between the first brightness value of the backlight partition in the current frame and the first brightness value of the previous frame is greater than a first preset value, adjusting the first brightness value of the backlight partition in the current frame to obtain an adjusted first brightness value, wherein the first brightness value is the brightness value when the first light emitting source is turned on;
and comparing the second brightness value of the backlight partition in the current frame with the second brightness value of the previous frame, and if the difference between the second brightness value of the backlight partition in the current frame and the second brightness value of the previous frame is greater than a second preset value, adjusting the second brightness value of the backlight partition in the current frame to obtain an adjusted second brightness value, wherein the second brightness value is the brightness value of the second light source when the second light source is lighted.
In application, the adjusted first brightness value is the brightness value of the first light-emitting source in the backlight partition after correction, the adjusted second brightness value is the brightness value of the second light-emitting source in the backlight partition after correction, and when the backlight partition is driven, the first light-emitting source is lightened by the adjusted first brightness value, and the second light-emitting source is lightened by the adjusted second brightness value.
In the above embodiment, the maximum initial gray-scale values of the R, G, B color channels of each pixel point corresponding to each pixel region in the current frame image are respectively assigned to each backlight partition to obtain the display parameters of the backlight unit, so that the driving effect and precision of the monochrome backlight unit during dynamic backlight driving can be effectively improved.
As shown in fig. 3, in one embodiment, when the backlight is partitioned into two-color light-emitting sources consisting of a first light-emitting source and a second light-emitting source, step S201 includes:
step S301, for each backlight partition, obtaining a gray scale value of each pixel point in a pixel area corresponding to the backlight partition;
step S302, respectively selecting a maximum gray scale value corresponding to the first light-emitting source and a maximum gray scale value corresponding to the second light-emitting source in the pixel region corresponding to the backlight partition.
In application, the gray scale value of each pixel point in the pixel region is the initial gray scale value of R, G, B color channels of each pixel point corresponding to the pixel region in the current frame image. When the backlight partition is a dual-color light emitting source composed of a first light emitting source with a first color and a second light emitting source with a second color, respectively selecting a maximum gray scale value corresponding to the first light emitting source and a maximum gray scale value corresponding to the second light emitting source from gray scale values of each pixel point in a pixel area corresponding to the backlight partition, namely selecting a maximum initial gray scale value from initial gray scale values of a first color channel and selecting a maximum initial gray scale value from initial gray scale values of a second color channel of each pixel point corresponding to the pixel area in a current frame image. One of the first color and the second color is blue, and the other is red or green.
Step S303, calculating a ratio of a maximum gray scale value corresponding to the first light-emitting source to a maximum gray scale value corresponding to the second light-emitting source;
step S304, comparing the calculated ratio with the original ratio, selecting the maximum gray-scale value corresponding to the comparison result and assigning the maximum gray-scale value to the backlight subarea to obtain the display parameters of the backlight subarea.
In application, if the calculated ratio is greater than the original ratio, assigning the maximum gray-scale value corresponding to the first light-emitting source to the backlight partition; otherwise, assigning the maximum gray-scale value corresponding to the second luminous source to the backlight subarea. The raw ratio is a luminance ratio of the first light source and the second light source when the first light source and the second light source are lighted before the display unit and the backlight unit are driven according to the display control method provided by the embodiment.
In application, the maximum brightness value corresponding to the first light-emitting source and the maximum brightness value corresponding to the second light-emitting source can be calculated according to the maximum gray-scale value corresponding to the first light-emitting source, the maximum gray-scale value corresponding to the second light-emitting source, and the conversion formula of the gray-scale values and the brightness values. Supposing that the first light-emitting source is blue, the maximum value of blue brightness corresponding to the first light-emitting source is LBmax, the maximum value of red brightness corresponding to the second light-emitting source is LRmax, and the original ratio is K; if LBmax K is larger than LRmax, assigning LBmax to the backlight partition; and when LBmax K is less than or equal to LRmax, assigning LRmax to the backlight subarea. And similarly, the display parameters of all backlight partitions in the backlight unit can be obtained, so that the display parameters of the backlight unit can be obtained.
In the embodiment corresponding to fig. 3, the maximum gray scale value corresponding to the first light-emitting source and the maximum gray scale value corresponding to the second light-emitting source are selected from the initial gray scale values of R, G, B color channels of each pixel point corresponding to the pixel region in the current frame image, and the luminance ratio of the first light-emitting source and the second light-emitting source when lit is obtained before the display unit and the backlight unit are driven according to the display control method provided by the embodiment, so that the driving effect and the precision when the dynamic backlight driving is performed on the two-color backlight unit can be effectively improved.
In one embodiment, when the backlight partition includes R light emitting sources, B light emitting sources, and G light emitting sources, step S201 includes:
for each backlight partition, R, G, B gray-scale values of each pixel point in the pixel region corresponding to the backlight partition are obtained;
selecting the maximum R gray-scale value in the pixel region and assigning the maximum R gray-scale value to the R light source of the backlight subarea;
selecting the maximum G gray-scale value in the pixel region and assigning the maximum G gray-scale value to the G light source of the backlight subarea;
selecting the maximum B gray-scale value in the pixel region and assigning the maximum B gray-scale value to the B light source of the backlight subarea;
adding the selected maximum R, G, B grayscale value to the display parameters of the backlight partition.
In application, when the backlight partition includes R light sources, B light sources and G light sources, the R, G, B gray-scale values of each pixel in the pixel region are the initial gray-scale values of R, G, B color channels of each pixel corresponding to the pixel region in the current frame image. The maximum R gray-scale value in the pixel area is the maximum value in the initial gray-scale values of the R color channels of each pixel point corresponding to the pixel area in the current frame image, the maximum G gray-scale value in the pixel area is the maximum value in the initial gray-scale values of the G color channels of each pixel point corresponding to the pixel area in the current frame image, and the maximum B gray-scale value in the pixel area is the maximum value in the initial gray-scale values of the B color channels of each pixel point corresponding to the pixel area in the current frame image. And similarly, the display parameters of all backlight partitions in the backlight unit can be obtained, so that the display parameters of the backlight unit can be obtained.
In application, the display parameters of the backlight partition and the backlight unit in the above embodiments refer to gray scale values. After the gray-scale values of the backlight partitions or the backlight units are obtained, the brightness values of the backlight partitions can be obtained through calculation according to a conversion formula between the gray-scale values and the brightness values, and further the brightness values of the backlight units can be obtained according to the brightness values of all the backlight partitions.
In one embodiment, the conversion formula between the gray level value and the brightness value is: l ═ f (gs), f (x) ═ x ^ gamma;
wherein, L represents brightness value, GS represents gray level value, f (x) represents gamma curve function, x represents variable of gamma curve function, and gamma represents gamma value.
In application, gamma may take on a value of 2.2.
In the above embodiment, the display parameters of the backlight unit are obtained by respectively sending the maximum value of the initial gray scale values of the R color channels, the maximum value of the initial gray scale values of the G color channels, and the maximum value of the initial gray scale values of the B color channels of all the pixel points corresponding to the pixel region in the current frame image to the R light source, the G light source, and the B light source of the backlight partition, so that the driving effect and the precision of the full-color backlight unit during dynamic backlight driving can be effectively improved.
As shown in fig. 4, in one embodiment, after step S201, the method includes:
step S401, comparing the brightness value of the previous M frames of the backlight partition with the brightness value of the current frame, and adjusting the brightness value of the current frame based on the comparison result; wherein M is more than or equal to 1 and is an integer, and each frame in the previous M frames corresponds to a first preset threshold;
step S402, updating the display parameters based on the adjusted brightness values to obtain the adjusted display parameters of the backlight subarea.
In one embodiment, step S401 includes:
calculating the difference value between the brightness value of each frame in the previous M frames and the brightness value of the current frame of the backlight partition to obtain the brightness value variation of each frame and the current frame of the backlight partition in the previous M frames;
and if the absolute value of the brightness value variation of any one of the previous M frames and the current frame of the backlight partition is greater than the first preset threshold corresponding to any one of the previous M frames, correcting the brightness value of the backlight partition in the current frame to ensure that the absolute value of the brightness value variation of any one of the previous M frames and the current frame of the backlight partition is less than or equal to the first preset threshold corresponding to any one of the previous M frames.
In application, for each backlight partition, comparing the brightness values of the backlight partition in the previous frame and the current frame, and if the absolute value of the brightness value variation of the backlight partition is greater than the first preset threshold corresponding to the previous frame, correcting the brightness value of the backlight partition to make the absolute value of the brightness value variation of the backlight partition less than or equal to the first preset threshold corresponding to the previous frame. Or comparing the brightness values of the backlight partition in the current frame and the previous two or more frames, setting a corresponding first preset threshold for each previous frame, comparing the current value of the backlight partition with the brightness of each previous frame, obtaining the absolute value of the brightness variation of the backlight partition in the current frame relative to the brightness variation of each previous frame, comparing the absolute value with the first preset threshold corresponding to each previous frame, and if the absolute value of the brightness variation of the backlight partition in the current frame is greater than the first preset threshold corresponding to any previous frame, correcting the brightness value of the backlight partition to make the absolute value of the brightness variation of the backlight partition less than or equal to the first preset threshold corresponding to any previous frame. The first preset threshold corresponding to each frame in the previous M frames can be set according to actual needs, and the first preset thresholds corresponding to different frames can be the same or different.
In application, the method for acquiring the display parameters of the backlight partition for any one of the current frame and the previous M frames is the same, see step S201, and is not described herein again.
In the embodiment corresponding to fig. 4, the brightness value of the backlight partition in the current frame is adjusted by comparing the brightness value of the backlight partition in the current frame with the brightness value of at least one frame before the current frame, so that the driving effect and the driving precision of the backlight unit can be effectively improved.
As shown in fig. 5, in one embodiment, after step S201, S203 or S402, the method includes:
step S501, comparing the adjusted brightness value of the backlight partition with the adjusted brightness value of the backlight partition corresponding to a preset area, correcting the brightness value of the backlight partition according to the comparison result, and updating the corrected display parameter of the backlight partition based on the corrected brightness value;
correspondingly, step S102 includes:
and calculating the display parameters of the display unit according to the corrected display parameters.
In an application, for each backlight partition, the preset region includes all or part of the backlight partitions within a first preset coordinate range around the backlight partition, where the first preset coordinate range may be set according to actual needs, and the method for obtaining the adjusted luminance values of the backlight partitions of the preset region is the same as the method for obtaining the luminance values of the backlight partitions in the foregoing embodiments, and is not repeated here.
Fig. 5 exemplarily shows a case where step S501 is included after step S203.
In one embodiment, step S501 includes:
calculating a difference value between the adjusted brightness value of the backlight partition and the adjusted brightness values of the N backlight partitions corresponding to the preset area, and acquiring a brightness value variation of the backlight partition relative to each backlight partition in the N backlight partitions; each backlight partition in the N backlight partitions corresponds to a second preset threshold, N is greater than or equal to 1 and is an integer;
if the absolute value of the brightness value variation of the backlight partition relative to any backlight partition in the N backlight partitions is greater than a second preset threshold corresponding to any backlight partition and the brightness value variation is a negative value, increasing the brightness value of the backlight partition so that the absolute value of the brightness value variation of the backlight partition relative to any backlight partition in the N backlight partitions is less than or equal to the second preset threshold corresponding to any backlight partition.
In application, the comparison result in step S501 is a difference between the adjusted luminance values of the backlight partitions and the adjusted luminance values of the N backlight partitions corresponding to the preset region, and when the first comparison result is greater than the second preset threshold corresponding to any backlight partition and the luminance value variation is a negative value, the luminance values of the backlight partitions are increased, so that the comparison result is less than or equal to the second preset threshold corresponding to any backlight partition. The second preset threshold corresponding to each backlight partition of the preset area may be set according to actual needs, and the second preset thresholds corresponding to different backlight partitions may be the same or different.
In an application, when, for each backlight partition, the N backlight partitions of the preset area include a central area within a first preset coordinate range around the backlight partition, the N backlight partitions include (2m1+1) × (2m1+1) -1 backlight partitions disposed around the backlight partition centering on the backlight partition, wherein 1 < m1 ≦ m and m1 are integers, when m 7, m1 ≦ 5, the N backlight partitions include 120 backlight partitions of the 224 backlight partitions, when the N backlight partitions of the preset area include an edge area within the first preset coordinate range around the backlight partition, the N backlight partitions include (2m +1) × (2m +1) - (2m2+1) × (2m2+1) backlight partitions disposed around the backlight partition, wherein 1 < m2 and m2 are integers, when m 357, and when m2 ≦ m 355, the N backlight partitions include N backlight partitions of the backlight partitions 224.
In one embodiment, when the backlight is partitioned into two-color light-emitting sources consisting of a first light-emitting source and a second light-emitting source, steps S201, S203 or S302 are followed or S501 includes:
comparing the adjusted first brightness value of the backlight partition with the adjusted first brightness value of the backlight partition corresponding to a preset area, and correcting the first brightness value of the backlight partition according to a comparison result;
comparing the adjusted second brightness value of the backlight partition with the adjusted second brightness value of the backlight partition corresponding to the preset area, and correcting the second brightness value of the backlight partition according to the comparison result;
and updating the corrected display parameters of the backlight subarea by the corrected first brightness value and the corrected second brightness value.
In application, when the backlight partition is a dual-color light emitting source composed of a first light emitting source and a second light emitting source, the first brightness value is a brightness value of the first light emitting source, the second brightness value is a brightness value of the second light emitting source, the adjusted first brightness value of the backlight partition of the preset region is a brightness value of the first light emitting source of the backlight partition of the preset region, the adjusted second brightness value of the backlight partition of the preset region is a brightness value of the second light emitting source of the backlight partition of the preset region, and the method for acquiring the adjusted first brightness value and the adjusted second brightness value of the backlight partition of the preset region is the same as the method for acquiring the first brightness value and the second brightness value of the backlight partition in the foregoing embodiment, and details are not repeated here.
In the embodiment corresponding to fig. 5, the brightness values of the backlight partitions are corrected according to the comparison result by comparing the adjusted brightness values of the backlight partitions with the adjusted brightness values of all the backlight partitions corresponding to the preset area, so that the driving effect and the driving precision of the backlight unit can be effectively improved.
As shown in fig. 6, in one embodiment, step S102 includes:
step S601, for each pixel point of the display unit, calculating the total brightness value contribution of the backlight partition corresponding to the pixel region where the pixel point is located and the backlight partition of the preset region of the backlight partition.
In application, for each pixel point of the display unit, the preset area comprises all or part of backlight partitions in a second preset coordinate range around the backlight area corresponding to the pixel area where the pixel point is located, and the second preset coordinate range can be set according to actual needs. And acquiring a first total brightness value generated in the pixel region where the pixel point is located when the backlight partition of the preset region illuminates the pixel region where the pixel point is located, and acquiring the total brightness value contribution.
In application, it is assumed that the second preset coordinate range is set as backlight regions having a difference of 1 to n (where n is greater than or equal to 1 and is an integer) between the abscissa and the ordinate of the backlight region corresponding to the pixel region where the pixel point is located, and when n is 4, the preset includes any backlight partition among (2n +1) × (2n +1) -1 — 80 backlight partitions that are set around the backlight region with the backlight region as the center.
In application, for each pixel point of a display unit, when a preset area comprises a central area in a second preset coordinate range around a backlight partition corresponding to a pixel area where the pixel point is located, the preset area comprises (2n1+1) × (2n1+1) -1 backlight partitions which are arranged around the backlight partition with the backlight partition as the center, wherein 1 < n1 is not less than n and n1 is an integer, when n 4 and n1 are 3, the preset area comprises 48 backlight partitions in 80 backlight partitions, when the preset area comprises an edge area in the second preset coordinate range around the backlight partition corresponding to the pixel area where the pixel point is located, the preset area comprises (2n +1) × (2n +1) - (2n2+1) × (2n2+1) backlight partitions which are arranged around the backlight partition as the center, wherein 1 < n 4 n and n 86523 are integers, and when n 24 is not more than n2+1, the preset area comprises 3680 backlight partitions.
Step S602, obtaining a ratio between the total luminance value contribution and a total luminance value when all backlight partitions are simultaneously lit.
In application, for each pixel point of the display unit, all backlight partitions of the backlight unit are obtained to be lightened at the same brightness value, when the pixel area where the pixel point is located is illuminated, a second total brightness value generated in the pixel area where the pixel point is located is obtained, and then the ratio of the first total brightness value to the second total brightness value is calculated.
Step S603, obtaining display parameters corresponding to the pixel points based on the ratio and the display parameters of the backlight unit.
In application, in step S603, the brightness value of the backlight partition corresponding to the pixel region where each pixel of the display unit is located is modified according to the ratio and the gamma curve function, so as to obtain a modified gray level value of each pixel, that is, a display parameter of each pixel.
Step S604, repeating the above steps to obtain display parameters corresponding to all the pixel points, and taking the display parameters corresponding to all the pixel points as the display parameters of the display unit.
In application, after step S604, in step S104, the display unit is driven to display the current frame image based on the modified gray-scale value of each pixel point
In one embodiment, step S603 includes:
calculating display parameters corresponding to the pixel points based on the ratio, the display parameters of the backlight unit and a gray scale formula, wherein the gray scale formula is as follows: GS' (x, y) ═ f-1(k (x, y) × f (GS)), wherein GS' (x, y) represents a gray-scale value corresponding to the pixel point, k (x, y) represents the ratio, f (GS) represents a luminance value of a backlight unit, and (x, y) represents coordinates of the pixel point in the display unit.
In one embodiment, the implementation formula of step S603 is as follows:
k(x,y)＝L0/L(x,y)；
GS’(x,y)＝f-1(k(x,y)*f(GS))；
f(x)＝x^gamma；
wherein L (x, y) represents a first luminance value, L0 represents a second luminance value, GS' (x, y) represents a gray-scale value of a pixel region, f (x) represents a gamma curve function, x represents a variable of the gamma curve function, gamma represents a gamma value, and (x, y) represents coordinates of the pixel region in the display unit.
In the embodiment corresponding to fig. 6, the display parameter corresponding to each pixel point is obtained according to the total luminance value contribution of the backlight partition in the pixel region where each pixel point of the display unit is located and the preset region of the backlight partition, the ratio between the total luminance value contribution and the total luminance value when all the backlight partitions are simultaneously lit, and the display parameter of the backlight unit, so that the more accurate display parameter of the display unit can be obtained, and the display effect when the display unit is driven to display an image is effectively improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
As shown in fig. 7, an embodiment of the present invention provides a display device 1000 including: a backlight unit 100, a display unit 200, a processor 300, a memory 400 and a computer program 401, e.g. a driver, stored in said memory 400 and executable on said processor 300. The processor 300 implements the steps in the above-described respective display control method embodiments, such as the steps S101 to S104 shown in fig. 1, when executing the computer program 401.
Illustratively, the computer program 401 may be partitioned into one or more modules that are stored in the memory 400 and executed by the processor 300 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 401 in the display device 1000. For example, the computer program 401 may be divided into an acquisition module, a calculation module, a backlight driving module, and a display driving module, and the specific functions of each module are as follows:
the acquisition module is used for acquiring the display parameters of the backlight unit according to the initial display parameters of the current frame image;
the calculation module is used for calculating the display parameters of the display unit according to the display parameters of the backlight unit;
the backlight driving module is used for driving the backlight unit to emit light based on the display parameters of the backlight unit;
and the display driving module is used for driving the display unit to display the current frame image based on the display parameters of the display unit.
The display device 1000 may be a display device such as a monitor, a mobile phone, a television, and an advertisement machine. The display device may include, but is not limited to, a backlight unit 100, a display unit 200, a processor 300, and a memory 400. Those skilled in the art will appreciate that fig. 7 is merely an example of the display apparatus 1000, and does not constitute a limitation of the display apparatus 1000, and may include more or less components than those shown, or combine some of the components, or different components, for example, the display apparatus may further include an input-output device, a network access device, a bus, etc.
The memory 400 may be an internal storage unit of the display apparatus 1000, such as a hard disk or a memory of the display apparatus 1000. The memory 400 may also be an external storage device of the display apparatus 1000, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the display apparatus 1000. Further, the memory 400 may also include both an internal storage unit and an external storage device of the display apparatus 1000. The memory 400 is used to store the computer program and other programs and data required by the display device. The memory 400 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components 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 units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units 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 units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated module, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (14)

1. A display control method is applied to a display device, the display device comprises a backlight unit and a display unit, and the display control method comprises the following steps:
acquiring display parameters of the backlight unit according to the initial display parameters of the current frame image;
calculating display parameters of the display unit according to the display parameters of the backlight unit;
driving the backlight unit to emit light based on the display parameters of the backlight unit;
and driving the display unit to display the current frame image based on the display parameters of the display unit.
2. The method as claimed in claim 1, wherein the display unit comprises a plurality of pixel regions, each of the pixel regions corresponds to one of the backlight partitions, and the obtaining the display parameters of the backlight unit according to the initial display parameters of the current frame image comprises:
and for each backlight subarea, acquiring the maximum gray-scale value of the pixel area corresponding to the backlight subarea under the current frame image, and assigning the maximum gray-scale value to the backlight subarea to obtain the display parameters of the backlight subarea.
3. The method according to claim 2, wherein for each backlight partition, obtaining a maximum grayscale value of a pixel region corresponding to the backlight partition in a current frame image, assigning the maximum grayscale value to the backlight partition, and obtaining the display parameters of the backlight partition, further comprises:
comparing the brightness value of the backlight partition in the previous frame with the brightness value of the backlight partition in the current frame, and adjusting the brightness value of the backlight partition in the current frame based on the comparison result;
and updating the display parameters based on the adjusted brightness values to obtain the adjusted display parameters of the backlight subarea.
4. The display control method according to claim 3, wherein after updating the display parameters based on the adjusted brightness to obtain the adjusted display parameters of the backlight partition, the method further comprises:
comparing the adjusted brightness value of the backlight partition with the adjusted brightness value of the backlight partition corresponding to a preset area, correcting the brightness value of the backlight partition according to the comparison result, and updating the corrected display parameter of the backlight partition based on the corrected brightness value;
the calculating the display parameters of the display unit according to the display parameters of the backlight unit specifically comprises:
and calculating the display parameters of the display unit according to the corrected display parameters.
5. The method as claimed in claim 2, wherein when the backlight partition is a monochromatic light source, the obtaining a maximum gray-scale value of a pixel region corresponding to the backlight partition in a current frame image, and assigning the maximum gray-scale value to the backlight partition to obtain the display parameters of the backlight partition comprises:
acquiring a gray scale value of each pixel point in a pixel area corresponding to the backlight partition;
and selecting the obtained maximum gray-scale value, and assigning the selected maximum gray-scale value to the backlight subarea to obtain the display parameters of the backlight subarea.
6. The method as claimed in claim 2, wherein when the backlight partition is a dual-color light emitting source composed of a first light emitting source and a second light emitting source, the obtaining a maximum gray level value of a pixel region corresponding to the backlight partition in a current frame image, and assigning the maximum gray level value to the backlight partition to obtain the display parameters of the backlight partition comprises:
acquiring a gray scale value of each pixel point in a pixel area corresponding to the backlight partition;
respectively selecting the maximum gray-scale value corresponding to the first luminous source and the maximum gray-scale value corresponding to the second luminous source in the pixel region corresponding to the backlight partition;
calculating the ratio of the maximum gray scale value corresponding to the first light-emitting source to the maximum gray scale value corresponding to the second light-emitting source;
and comparing the calculated ratio with the original ratio, selecting the maximum gray-scale value corresponding to the comparison result, and assigning the maximum gray-scale value to the backlight subarea to obtain the display parameters of the backlight subarea.
7. The method as claimed in claim 2, wherein when the backlight partition includes R light sources, B light sources, and G light sources, the obtaining a maximum gray-scale value of a pixel region corresponding to the backlight partition in a current frame image, and assigning the maximum gray-scale value to the backlight partition to obtain the display parameters of the backlight partition includes:
r, G, B gray-scale values of each pixel point in the pixel area corresponding to the backlight partition are obtained;
selecting the maximum R gray-scale value in the pixel region and assigning the maximum R gray-scale value to the R light source of the backlight subarea;
selecting the maximum G gray-scale value in the pixel region and assigning the maximum G gray-scale value to the G light source of the backlight subarea;
selecting the maximum B gray-scale value in the pixel region and assigning the maximum B gray-scale value to the B light source of the backlight subarea;
adding the selected maximum R, G, B grayscale value to the display parameters of the backlight partition.
8. The method as claimed in claim 3, wherein when the backlight partition is a dual-color light source composed of a first light source and a second light source, the comparing the brightness value of the backlight partition in the previous frame with the brightness value of the backlight partition in the current frame, and adjusting the brightness value of the backlight partition in the current frame based on the comparison result comprises:
comparing the first brightness value of the backlight partition in the current frame with the first brightness value of the previous frame, and if the difference between the first brightness value of the backlight partition in the current frame and the first brightness value of the previous frame is greater than a first preset value, adjusting the first brightness value of the backlight partition in the current frame to obtain an adjusted first brightness value, wherein the first brightness value is the brightness value when the first light emitting source is turned on;
and comparing the second brightness value of the backlight partition in the current frame with the second brightness value of the previous frame, and if the difference between the second brightness value of the backlight partition in the current frame and the second brightness value of the previous frame is greater than a second preset value, adjusting the second brightness value of the backlight partition in the current frame to obtain an adjusted second brightness value, wherein the second brightness value is the brightness value of the second light source when the second light source is lighted.
9. The method according to claim 8, wherein after updating the display parameter based on the adjusted luminance value to obtain the adjusted display parameter of the backlight partition, the method further comprises:
comparing the adjusted first brightness value of the backlight partition with the adjusted first brightness value of the backlight partition corresponding to a preset area, and correcting the first brightness value of the backlight partition according to a comparison result;
comparing the adjusted second brightness value of the backlight partition with the adjusted second brightness value of the backlight partition corresponding to the preset area, and correcting the second brightness value of the backlight partition according to the comparison result;
and updating the corrected display parameters of the backlight subarea by the corrected first brightness value and the corrected second brightness value.
10. The method as claimed in claim 6, wherein the comparing the calculated ratio with the original ratio, selecting the maximum gray-scale value corresponding to the comparison result to be assigned to the backlight partition, and obtaining the display parameters of the backlight partition comprises:
if the calculated ratio is smaller than the original ratio, assigning the maximum gray-scale value corresponding to the second light-emitting source to the backlight subarea to obtain the display parameters of the backlight subarea;
and if the calculated ratio is not greater than the original ratio, assigning the maximum gray-scale value corresponding to the first light-emitting source to the backlight subarea to obtain the display parameters of the backlight subarea.
11. The display control method of claim 2, wherein calculating the display parameters of the display unit according to the display parameters of the backlight unit comprises:
for each pixel point of the display unit, calculating the total brightness value contribution of a backlight partition corresponding to the pixel region where the pixel point is located and the backlight partition of a preset region of the backlight partition;
obtaining the ratio of the total brightness value contribution to the total brightness value when all backlight partitions are simultaneously lighted;
acquiring display parameters corresponding to the pixel points based on the ratio and the display parameters of the backlight unit;
and repeating the steps to obtain the display parameters corresponding to all the pixel points, and taking the display parameters corresponding to all the pixel points as the display parameters of the display unit.
12. The method as claimed in claim 11, wherein the obtaining the display parameter corresponding to the pixel point based on the ratio and the display parameter of the backlight unit comprises:
calculating display parameters corresponding to the pixel points based on the ratio, the display parameters of the backlight unit and a gray scale formula, wherein the gray scale formula is as follows: GS' (x, y) ═ f-1(k (x, y) × f (GS)), where GS' (x, y) represents a gray-scale value corresponding to the pixel point, k (x, y) represents the ratio, f (GS) represents a luminance value of the backlight unit, and (x, y) represents coordinates of the pixel point in the display unit.
13. A display device comprising a backlight unit, a display unit, a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the display control method according to any one of claims 1 to 12 when executing the computer program.
14. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the display control method according to any one of claims 1 to 12.
CN201911423023.2A 2019-12-31 2019-12-31 Display control method, display device and storage medium Pending CN111341275A (en)

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Application publication date: 20200626