CN104200781B - Into or backlight control method and device when exiting wide-screen film display pattern - Google Patents

Into or backlight control method and device when exiting wide-screen film display pattern Download PDF

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Publication number
CN104200781B
CN104200781B CN201410433098.XA CN201410433098A CN104200781B CN 104200781 B CN104200781 B CN 104200781B CN 201410433098 A CN201410433098 A CN 201410433098A CN 104200781 B CN104200781 B CN 104200781B
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China
Prior art keywords
backlight
displayed
image
backlight source
area
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CN201410433098.XA
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CN104200781A (en
Inventor
杨�嘉
黄顺明
张玉欣
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Hisense Visual Technology Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Priority to CN201710134889.6A priority Critical patent/CN106611587B/en
Priority to CN201410433098.XA priority patent/CN104200781B/en
Priority to CN201710136155.1A priority patent/CN106652924B/en
Priority to US14/547,508 priority patent/US10165217B2/en
Publication of CN104200781A publication Critical patent/CN104200781A/en
Application granted granted Critical
Publication of CN104200781B publication Critical patent/CN104200781B/en
Priority to US16/206,254 priority patent/US10965898B2/en
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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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • 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
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/488—Data services, e.g. news ticker
    • H04N21/4884—Data services, e.g. news ticker for displaying subtitles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/44504—Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

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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)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Graphics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention discloses entering or backlight control method and device when exiting wide-screen film display pattern, the method includes：Determine display screen show image to be displayed when, the first backlight state of backlight subarea in the display screen；Judge whether the first backlight state of the backlight subarea is identical with the second backlight state of the previous frame image of image to be displayed backlight subarea when showing；If different, then according to the first backlight state and the second backlight state, the back light source brightness value of the backlight subarea is set, so that back light source brightness value monotone variation when the continuous N two field pictures started from the image to be displayed are shown in the backlight subarea, wherein, N is the positive integer more than 0.The backlight scintillation occurred when can avoid and repeatedly switch backlight state by method provided in an embodiment of the present invention.

Description

Backlight source control method and device when entering or exiting wide-screen film display mode
Technical Field
The invention relates to the field of backlight control, in particular to a backlight control method and device when entering or exiting a wide-screen movie display mode.
Background
The liquid crystal display panel is extruded by the frame due to the assembly and fixation of the liquid crystal screen, so that the arrangement structure of liquid crystal molecules at four corners is changed; or local unevenness of the display screen due to the manufacturing of the optical film; or due to the fact that the display screen is locally fixed infirm or the surface flatness is reduced due to thermal expansion, the light leakage phenomenon of the liquid crystal is easily sensed when the content of the image is a black image or a low-brightness scene under the viewing condition that the ambient light is weak, and therefore the image quality is damaged. Especially when playing certain proportional formats, such as wide screen movies, it has black areas in itself; or because the aspect ratio of the liquid crystal display screen is different from the aspect ratio of the played film, a black area exists in the display screen, for example, the aspect ratio of the display screen of the liquid crystal television is 16: 9, and the aspect ratio of wide screen movies is approximately 21: 9, as shown in figure 1.
In the wide-screen movie display mode, the light leakage phenomenon occurs in the black area of the display screen for the following reasons: the optical film causes local unevenness of the display screen due to manufacturing reasons; the surface flatness of the display screen is reduced due to local infirm fixation or thermal expansion; because of the fixed frame extrusion that causes of display screen equipment leads to the four corners light leak of display screen. When the image content is a black picture or a low-brightness scene, the light leakage phenomenon of the liquid crystal is easily perceived under the viewing condition that the ambient light is weak, thereby damaging the image quality.
Therefore, in the wide-screen movie display mode, the backlight source of the backlight partition corresponding to the black area in the display screen needs to be turned off, so that the light leakage phenomenon can be eliminated. However, the backlight is frequently turned on and off, which causes flickering of the backlight and visual discomfort to the viewer. Currently, there is no good solution to this problem.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling a backlight source when entering or exiting a wide-screen movie display mode, which are used for solving the problem that the backlight source of a display screen flickers when images displayed in a backlight partition meet the conditions of turning on and off the backlight source for multiple times in a short time in the prior art.
The embodiment of the invention provides a backlight source control method when entering or exiting a wide-screen movie display mode, which comprises the following steps:
after receiving a wide-screen movie display mode switching instruction, determining a backlight source state of a backlight partition in a display screen, wherein the backlight partition is a backlight partition corresponding to a black area in the wide-screen movie display mode in the display screen, and the backlight source state is backlight source on or backlight source off;
determining whether the backlight source state of the backlight subarea meets a backlight source control condition;
if so, setting the backlight source brightness value of the backlight subarea to enable the backlight source brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the images are displayed in the backlight subarea, wherein N is a positive integer larger than 0.
Preferably, the determining whether the backlight source state of the backlight partition satisfies the backlight source control condition includes:
judging whether the backlight source state of the backlight subarea is the same as the backlight source state of the previous frame image of the image to be displayed in the backlight subarea;
and if the two areas are different, determining that the backlight subareas meet the backlight source control conditions.
Preferably, the setting the backlight brightness value of the image to be displayed in the backlight partition so that the backlight brightness value of N consecutive frame images starting from the image to be displayed when displayed in the backlight partition changes monotonically includes:
if the backlight source state is that the backlight source is closed, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value required when the continuous N frames of images starting from the image to be displayed are displayed in the backlight subarea to be monotonically decreased;
and if the backlight source state is that the backlight source is started, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value of the continuous N frames of images starting from the image to be displayed to be monotonically increased when the images are displayed in the backlight subarea.
Preferably, the setting the backlight brightness value of the image to be displayed in the backlight partition so that the backlight brightness value of N consecutive frame images starting from the image to be displayed in the backlight partition monotonically decreases includes:
and forming an arithmetic progression by the backlight source brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and takes one minus N-th of the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a tolerance.
Preferably, the setting the backlight brightness value of the image to be displayed in the backlight partition so that the backlight brightness value of N consecutive frame images starting from the image to be displayed in the backlight partition is monotonically increased when the images are displayed in the backlight partition includes:
determining the backlight source brightness value of the backlight subarea when the image to be displayed is displayed;
and forming an arithmetic progression by the backlight brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and one-N of the backlight brightness values of the backlight subarea when the image to be displayed is displayed as a tolerance.
Preferably, before receiving the command for switching the display mode of the wide-screen movie, the method includes:
and judging whether to display the image to be displayed in the display screen in a wide-screen movie display mode.
Preferably, the determining whether to display the image to be displayed in the display screen in the wide-screen movie display mode includes:
acquiring the image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is a black area at the top of the display screen, and the second area is a black area at the bottom of the display screen;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, wherein the second threshold value is larger than 0;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, when the image to be displayed is displayed in the display screen, determining the backlight partition in the display screen, which needs to turn off the backlight source, includes:
acquiring an image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is an area corresponding to a black area at the top of the display screen, and the second area is an area corresponding to a black area at the bottom of the display screen;
acquiring a display mode of the first M continuous frames of images to be displayed, wherein M is a positive integer greater than 0;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, the second threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, after the determining that the image to be displayed is displayed in the wide-screen movie display mode, the method further includes:
and closing the backlight source of the backlight subarea corresponding to the first area, judging whether the subtitles are displayed in the second area, and if the subtitles are not displayed, closing the backlight source of the backlight subarea corresponding to the second area.
The embodiment of the invention provides a backlight source control device when entering or exiting a wide-screen movie display mode, which comprises:
the backlight source state determining unit is used for determining the backlight source state of a backlight partition in a display screen after receiving a wide-screen movie display mode switching instruction, wherein the backlight partition is a backlight partition corresponding to a black area in the wide-screen movie display mode in the display screen, and the backlight source state is the state that the backlight source is turned on or turned off;
a backlight control condition determining unit for determining whether the backlight state of the backlight partition satisfies a backlight control condition;
and the backlight control unit is used for setting the backlight brightness value of the backlight subarea when the backlight control condition is met so as to enable the backlight brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the continuous N frames of images are displayed in the backlight subarea, wherein N is a positive integer larger than 0.
Preferably, the backlight control condition determining unit is specifically configured to:
judging whether the backlight source state of the backlight subarea is the same as the backlight source state of the previous frame image of the image to be displayed in the backlight subarea;
and if the two areas are different, determining that the backlight subareas meet the backlight source control conditions.
Preferably, the backlight control unit is specifically configured to:
if the backlight source state is that the backlight source is closed, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value required when the continuous N frames of images starting from the image to be displayed are displayed in the backlight subarea to be monotonically decreased;
and if the backlight source state is that the backlight source is started, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value of the continuous N frames of images starting from the image to be displayed to be monotonically increased when the images are displayed in the backlight subarea.
Preferably, the backlight control unit is specifically configured to:
and forming an arithmetic progression by the backlight source brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and takes one minus N-th of the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a tolerance.
Preferably, the backlight control unit is specifically configured to:
determining the backlight source brightness value of the backlight subarea when the image to be displayed is displayed;
and forming an arithmetic progression by the backlight brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and one-N of the backlight brightness values of the backlight subarea when the image to be displayed is displayed as a tolerance.
Preferably, the backlight source state determining unit is specifically configured to:
and judging whether to display the image to be displayed in the display screen in a wide-screen movie display mode.
Preferably, the backlight source state determining unit is specifically configured to:
acquiring the image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is a black area at the top of the display screen, and the second area is a black area at the bottom of the display screen;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, wherein the second threshold value is larger than 0;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, the backlight source state determining unit is specifically configured to:
acquiring an image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is an area corresponding to a black area at the top of the display screen, and the second area is an area corresponding to a black area at the bottom of the display screen;
acquiring a display mode of the first M continuous frames of images to be displayed, wherein M is a positive integer greater than 0;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, the second threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, the backlight control unit is further configured to:
and closing the backlight source of the backlight subarea corresponding to the first area, judging whether the subtitles are displayed in the second area, and if the subtitles are not displayed, closing the backlight source of the backlight subarea corresponding to the second area.
According to the method provided by the embodiment of the invention, when the state of the backlight source of the backlight partition is switched, the state of the backlight source is changed in a mode of delaying N frames of images, and the brightness value of the backlight source required by delaying N frames of images changes monotonously.
Drawings
FIG. 1 is a schematic diagram of displaying an image with black regions in a display screen;
fig. 2 is a flowchart of a backlight control method when entering or exiting a wide-screen movie display mode according to an embodiment of the present invention;
FIG. 3 illustrates a display screen partitioning scheme for 1D or 1.5D local dimming techniques;
FIG. 4 is a schematic diagram of a wide-screen movie display mode image displayed on a display screen;
FIG. 5 is a schematic view of a first area of a wide-screen film display mode image on a display screen;
FIG. 6 is a schematic view of a second area of a wide-screen film display mode image on a display screen;
fig. 7 is a structural diagram of a backlight control device when entering or exiting a wide-screen movie display mode according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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 embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, a flowchart of a backlight control method when entering or exiting a display mode of a wide-screen movie according to an embodiment of the present invention includes:
step 201: after receiving a wide-screen movie display mode switching instruction, determining a backlight source state of a backlight partition in a display screen, wherein the backlight partition is a backlight partition corresponding to a black area in the wide-screen movie display mode in the display screen, and the backlight source state is backlight source on or backlight source off;
step 202: determining whether the backlight source state of the backlight subarea meets a backlight source control condition;
step 203: if so, setting the backlight source brightness value of the backlight subarea to enable the backlight source brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the images are displayed in the backlight subarea, wherein N is a positive integer larger than 0.
When the display screen displays images, the backlight module is required to provide a continuous backlight source, in the prior art, the backlight source is often in a long bright state, and the long bright state of the backlight source can cause the phenomena of reduced image contrast, light leakage and the like when the images which do not need the backlight source are displayed.
At present, a backlight module of a display screen is generally divided into a plurality of backlight modules by a Local Dimming (Local Dimming) technology, a display screen area covered by each backlight module is called a backlight partition, a backlight source of each backlight partition is independently controlled, and the backlight source of the area is turned off when the backlight partition does not need the backlight source.
As shown in fig. 3, for the display screen division mode adopted by the 1D or 1.5D local dimming technology, the display screen is divided into 16 backlight partitions in fig. 3, wherein the display screen is divided into 8 equal partitions horizontally and 2 equal partitions vertically. The backlight module can adjust the brightness of the backlight source while providing the backlight source, and the backlight module can adjust the brightness of the backlight source according to the brightness required by an image to be displayed. The display screen in the embodiment of the present invention is generally referred to as an LCD.
The backlight module determines whether the image displayed in the display screen is displayed in the wide-screen movie display mode or not by receiving the wide-screen movie display mode switching instruction.
In the embodiment of the invention, the display of the image in the wide-screen movie display mode is determined by the following method:
firstly, acquiring an image to be displayed, and determining a first image of the image to be displayed in a first area of a display screen and a second image of the image to be displayed in a second area of the display screen, wherein the first area is a predetermined area positioned at the top of the display screen, and the second area is a predetermined area positioned at the bottom of the display screen;
then, acquiring pixel gray-scale values of pixels in the first image and the second image;
finally, if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, determining that the image to be displayed is displayed in a wide-screen movie display mode, wherein the value range of the first threshold value is 0 to 20; or, if the average pixel gray-scale value of all pixels in the first image is smaller than the first threshold, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is greater than a second threshold, where the second threshold is 80%, determining that the image to be displayed is displayed in the wide-screen movie display mode.
After the gray-scale value of the pixel of the image to be displayed is determined to meet the condition of the wide-screen movie display mode, the image to be displayed can be determined to be displayed in the wide-screen movie display mode.
Preferably, on the basis of the above condition, a judgment condition may be added, that is: and determining whether the images to be displayed are displayed in a wide-screen movie display mode when the images which are continuous with the first N frames of the images to be displayed are displayed in the display screen, if so, determining that the images to be displayed are displayed in the wide-screen movie display mode in the display screen, and preferentially, N is at least larger than 10.
The method for determining the display mode of the N frames of continuous images before the image to be displayed during display comprises the following steps:
acquiring pixel gray-scale values of pixels of the first image and the second image of continuous previous N frames of images to be displayed, wherein N is preset and is greater than 1;
determining that the consecutive first N images are displayed in the wide-screen movie display mode when displayed if the pixel gray-scale values of all the pixels in the first image and the second image of each of the N images satisfy at least one of the following conditions:
if the average pixel gray-scale value of all pixels in the first image and the second image of the N frames of images is smaller than a first threshold value; or,
and if the average pixel gray-scale value of all the pixels in the first image of the N frames of images is smaller than the first threshold value, and the proportion of the number of the pixels with the pixel gray-scale value of 0 in the second image of at least one frame of image in the N frames of images is larger than a second threshold value.
Each frame of image in the first N frames of continuous images of the image to be displayed is in a wide-screen movie display mode, and meanwhile, the gray-scale value of the pixel of the image to be displayed also meets the condition of the wide-screen movie display mode, so that the image to be displayed can be determined to be displayed in the wide-screen movie display mode.
As shown in fig. 4, when an image displayed on the display screen enters the wide-screen movie display mode, fixed black regions unique to the wide-screen movie display mode are formed at the top and the bottom of the display screen, which are respectively referred to as a first region and a second region in the embodiment of the present invention, the first region is the fixed black region at the top of the display screen in the wide-screen movie display mode, and the second region is the fixed black region at the bottom of the display screen in the wide-screen movie display mode. The first area corresponds to the backlight subareas 1 and 8, the second area corresponds to the backlight subareas 9 and 16, and the backlight source can be turned off when the images are displayed in the wide-screen movie display mode in order to reduce the influence of the light leakage phenomenon on the images in the areas.
And after determining that the image to be displayed in the display screen is in the wide-screen movie display mode, turning off a backlight source of a part of backlight partitions in the display screen when the image in the wide-screen movie display mode is displayed. Specifically, the backlight source of which backlight partition is to be turned off in the display mode of the motion picture film with wide screen, there are two cases as follows:
as shown in fig. 5, in the first case, if all the gray-scale values of the pixels of the image to be displayed in the backlight partition of the first area are 0, that is, all the pixels are black, then the backlight does not need to be turned on, but due to the existence of noise, the gray-scale values of some pixels are not 0, so the average gray-scale value of the pixels of the image to be displayed in the backlight partition is smaller than the first threshold, as the condition that the backlight does not need to be turned on, and preferably, the first threshold is between 0 and 20.
In the second case, no subtitle is displayed in the backlight partition of the second region. Whether the caption is displayed in the second area is determined according to the characteristics of the gray-scale values of the pixels in the image when the caption is displayed. As shown in fig. 6, when the subtitles are displayed in the backlight partition of the second area, the gray scale values of the pixels of the image to be displayed in the backlight partition are 0, and the gray scale values of some of the pixels are the first gray scale values, which are generally 255. For this purpose, it is determined whether or not a subtitle is displayed in the second area as follows: and if the gray-scale value of at least one pixel in at least one row of image pixels of the second image is a first gray-scale value, determining that the second area displays the subtitles, wherein the first gray-scale value is 255. When the above condition is not satisfied in the backlight partition of the second area, it may be determined that there is no subtitle display in the area, and the backlight source of the backlight partition may be turned off.
If a wide-screen movie display mode switching instruction is received for multiple times in a short time, the backlight source state of a backlight partition where an area fixedly displaying a black picture is located in an image displaying the wide-screen movie display mode is changed for multiple times, the backlight source state comprises a backlight source opening and a backlight source closing part, and at the moment, the backlight source can be continuously opened and closed to generate a flickering phenomenon, so that great stimulation is brought to the vision of a viewer. For example, there are 5 continuous images, and the backlight states required for fixing the backlight partition where the area displayed as a black frame is located in the image displayed in the wide-screen movie display mode are respectively: the method comprises the steps of backlight source opening, backlight source closing, backlight source opening, backlight source closing and backlight source opening.
In order to avoid the above phenomenon, the flicker phenomenon can be avoided by delaying the backlight to be turned off or turned on. After receiving a display mode switching instruction of a wide-screen movie, determining a backlight source state of a backlight partition in a display screen, and then determining whether the backlight source state of the backlight partition meets a backlight source control condition, specifically, determining whether the backlight source state of the backlight partition is the same as the backlight source state of a previous frame of image of the image to be displayed in the backlight partition; and if the two areas are different, determining that the backlight subareas meet the backlight source control conditions.
And after determining whether the backlight source state of the backlight subarea meets the backlight source control condition, setting the backlight source brightness value of the backlight subarea to enable the backlight source brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the images are displayed in the backlight subarea, wherein N is a positive integer larger than 0.
There are two kinds of situations where the backlight brightness value in the backlight partition changes monotonically: in the first case, an instruction to switch from the non-cinemascope display mode to the cinemascope display mode is received. At this time, it is determined which backlight source of the backlight partition of the area needs to be turned off in the wide-screen movie display mode. And if the subtitles are not displayed, the backlight source of the backlight partition corresponding to the second area is closed. At this time, the backlight source is not immediately closed, but the backlight source of the backlight partition is closed after N frames of images are delayed, and the backlight source brightness value of the delayed N frames of images is set at the same time when the N frames of images are displayed, so that the backlight source brightness value of the delayed N frames of images is monotonically decreased according to the image display time, and the monotonic change is the backlight source brightness value when the previous frame of image of the image to be displayed is displayed as the initial backlight source brightness value.
Preferably, the backlight luminance values of the N delayed frame images form an arithmetic progression. When it is determined that the backlight source is turned off when the image to be displayed is displayed, and the backlight source is not turned off or the luminance value of the backlight source is not 0 when the backlight partition displays the previous frame image, the backlight source luminance values of the N frame images form an arithmetic progression taking the backlight source luminance value of the backlight partition when the previous frame image is displayed as the first item and taking one of negative nth of the backlight luminance value of the backlight partition when the previous frame image is displayed as a tolerance when the delayed N frame image is displayed, and the backlight source is turned off when the (N + 1) th frame image is displayed after the N frame image is delayed. For example, the luminance value of the backlight source of the backlight partition when displaying the previous frame image is 9, and 3 frames of images need to be delayed, then the backlight source is not turned off when the image to be displayed is displayed, but the luminance value of the backlight source is substituted by 9, at this time, the first item is 9, the tolerance is 3, the luminance value of the backlight source of the delayed second frame image is 6, the luminance value of the backlight source of the delayed second frame image is 3, and finally the backlight source is turned off when the 4 th frame image is displayed.
In the second case, an instruction to switch from the wide-screen movie display mode to the non-wide-screen movie display mode is received. At this time, it is determined which backlight source of the backlight partition of the area needs to be turned on in the wide-screen movie display mode. And if the subtitles are not displayed, the backlight source of the backlight partition corresponding to the second area is started. At this time, the backlight source is not immediately started, but after N frames of images are delayed, the backlight source brightness value required by the (N + 1) th frame of images is set as the backlight source brightness value required by the images to be displayed, and simultaneously, the backlight source brightness value of the delayed N frames of images is set during display, so that the backlight source brightness value of the delayed N frames of images is monotonically increased according to the image display time, and the monotonic change is the backlight source brightness value when the previous frame of images of the images to be displayed is displayed as the initial backlight source brightness value.
Preferably, when the delayed N frames of images are displayed, the backlight luminance values of the N frames of images form an arithmetic progression with 0 as the head and one-N times of the backlight luminance value required for the image to be displayed as a tolerance, and after delaying N frames, the backlight luminance value is set as the backlight luminance value required for the image to be displayed when the N +1 th frame of image is displayed. For example, the luminance value of the backlight source required by the image to be displayed is 9, a 3-frame image needs to be delayed, then the luminance value of the backlight source is substituted by 0 when the image to be displayed is displayed, at this time, the first item is 0, the tolerance is 3, the luminance value of the backlight source of the delayed second frame image is 6, and finally the luminance value of the backlight source is set to 9 when the 4 th frame image is displayed.
Based on the same technical concept, the embodiment of the invention also provides a backlight source control device when entering or exiting the display mode of the wide-screen movie, and the device can execute the method embodiment.
As shown in fig. 7, an embodiment of the present invention provides a backlight control apparatus for entering or exiting a wide-screen movie display mode, where the apparatus includes:
a backlight source state determining unit 701, configured to determine a backlight source state of a backlight partition in a display screen after receiving a display mode switching instruction of a wide-screen movie, where the backlight partition is a backlight partition corresponding to a black area in the display screen in the display mode of the wide-screen movie, and the backlight source state is a backlight source on state or a backlight source off state;
a backlight control condition determining unit 702 configured to determine whether a backlight state of the backlight partition satisfies a backlight control condition;
a backlight control unit 703 configured to set a backlight luminance value of the backlight partition when a backlight control condition is satisfied, so that the backlight luminance value when N consecutive frame images starting from the image to be displayed are displayed in the backlight partition monotonically changes, where N is a positive integer greater than 0.
Preferably, the backlight control condition determining unit 702 is specifically configured to:
judging whether the backlight source state of the backlight subarea is the same as the backlight source state of the previous frame image of the image to be displayed in the backlight subarea;
and if the two areas are different, determining that the backlight subareas meet the backlight source control conditions.
Preferably, the backlight control unit 703 is specifically configured to:
if the backlight source state is that the backlight source is closed, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value required when the continuous N frames of images starting from the image to be displayed are displayed in the backlight subarea to be monotonically decreased;
and if the backlight source state is that the backlight source is started, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value of the continuous N frames of images starting from the image to be displayed to be monotonically increased when the images are displayed in the backlight subarea.
Preferably, the backlight control unit 703 is specifically configured to:
and forming an arithmetic progression by the backlight source brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and takes one minus N-th of the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a tolerance.
Preferably, the backlight control unit 703 is specifically configured to:
determining the backlight source brightness value of the backlight subarea when the image to be displayed is displayed;
and forming an arithmetic progression by the backlight brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and one-N of the backlight brightness values of the backlight subarea when the image to be displayed is displayed as a tolerance.
Preferably, the backlight source state determining unit 701 is specifically configured to:
and judging whether to display the image to be displayed in the display screen in a wide-screen movie display mode.
Preferably, the backlight source state determining unit 701 is specifically configured to:
acquiring the image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is a black area at the top of the display screen, and the second area is a black area at the bottom of the display screen;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, wherein the second threshold value is larger than 0;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, the backlight source state determining unit 701 is specifically configured to:
acquiring an image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is an area corresponding to a black area at the top of the display screen, and the second area is an area corresponding to a black area at the bottom of the display screen;
acquiring a display mode of the first M continuous frames of images to be displayed, wherein M is a positive integer greater than 0;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, the second threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
Preferably, the backlight control unit 703 is further configured to:
and closing the backlight source of the backlight subarea corresponding to the first area, judging whether the subtitles are displayed in the second area, and if the subtitles are not displayed, closing the backlight source of the backlight subarea corresponding to the second area.
According to the method provided by the embodiment of the invention, when the state of the backlight source of the backlight partition is switched, the state of the backlight source is changed in a mode of delaying N frames of images, and the brightness value of the backlight source required by delaying N frames of images changes monotonously.
According to the method provided by the embodiment of the invention, when the state of the backlight source of the backlight partition is switched, the state of the backlight source is changed in a mode of delaying N frames of images, and the brightness value of the backlight source required by delaying N frames of images changes monotonously.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (16)

1. The backlight source control method when entering or exiting the wide-screen film display mode is characterized by comprising the following steps:
after receiving a wide-screen movie display mode switching instruction, determining a backlight source state of a backlight partition in a display screen, wherein the backlight partition is a backlight partition corresponding to a black area in the wide-screen movie display mode in the display screen, and the backlight source state is backlight source on or backlight source off;
determining whether the backlight source state of the backlight subarea meets a backlight source control condition; specifically, whether the backlight source state of the backlight partition is the same as the backlight source state of the previous frame of image of the image to be displayed in the backlight partition is judged; if the two areas are different, determining that the backlight subareas meet backlight source control conditions;
and if the backlight source control condition is met, setting the backlight source brightness value of the backlight subarea so as to enable the backlight source brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the images are displayed in the backlight subarea, wherein N is a positive integer greater than 0.
2. The method according to claim 1, wherein the setting of the backlight luminance values of the image to be displayed in the backlight partition so that the backlight luminance values when N consecutive frame images from the image to be displayed are displayed in the backlight partition monotonically change comprises:
if the backlight source state is that the backlight source is closed, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value required when the continuous N frames of images starting from the image to be displayed are displayed in the backlight subarea to be monotonically decreased;
and if the backlight source state is that the backlight source is started, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value of the continuous N frames of images starting from the image to be displayed to be monotonically increased when the images are displayed in the backlight subarea.
3. The method according to claim 2, wherein the setting the backlight luminance values of the image to be displayed in the backlight partition so that the backlight luminance values of N consecutive frame images starting from the image to be displayed when displayed in the backlight partition monotonically decrease comprises:
and forming an arithmetic progression by the backlight source brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and takes one minus N-th of the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a tolerance.
4. The method according to claim 2, wherein the setting the backlight luminance values of the image to be displayed in the backlight partition so that the backlight luminance values of N consecutive frame images starting from the image to be displayed when displayed in the backlight partition monotonically increase comprises:
determining the backlight source brightness value of the backlight subarea when the image to be displayed is displayed;
and forming an arithmetic progression by the backlight brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and one-N of the backlight brightness values of the backlight subarea when the image to be displayed is displayed as a tolerance.
5. The method of claim 1, wherein before receiving the command for switching the display mode of the motion picture in widescreen, the method comprises:
and judging whether to display the image to be displayed in the display screen in a wide-screen movie display mode.
6. The method of claim 5, wherein the determining whether to display the image to be displayed in the display screen in the wide-screen movie display mode comprises:
acquiring the image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is a black area at the top of the display screen, and the second area is a black area at the bottom of the display screen;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, wherein the second threshold value is larger than 0;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
7. The method of claim 5, wherein the determining whether to display the image to be displayed in a wide-screen movie display mode comprises:
acquiring an image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is an area corresponding to a black area at the top of the display screen, and the second area is an area corresponding to a black area at the bottom of the display screen;
acquiring a display mode of the first M continuous frames of images to be displayed, wherein M is a positive integer greater than 0;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, the second threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
8. The method of claim 6 or 7, wherein after determining to display the image to be displayed in the wide-screen movie display mode, further comprising:
and closing the backlight source of the backlight subarea corresponding to the first area, judging whether the subtitles are displayed in the second area, and if the subtitles are not displayed, closing the backlight source of the backlight subarea corresponding to the second area.
9. A backlight control device for entering or exiting a wide-screen movie display mode, the device comprising:
the backlight source state determining unit is used for determining the backlight source state of a backlight partition in a display screen after receiving a wide-screen movie display mode switching instruction, wherein the backlight partition is a backlight partition corresponding to a black area in the wide-screen movie display mode in the display screen, and the backlight source state is the state that the backlight source is turned on or turned off;
a backlight control condition determining unit for determining whether the backlight state of the backlight partition satisfies a backlight control condition; specifically, whether the backlight source state of the backlight partition is the same as the backlight source state of the previous frame of image of the image to be displayed in the backlight partition is judged; if the two areas are different, determining that the backlight subareas meet backlight source control conditions;
and the backlight control unit is used for setting the backlight brightness value of the backlight subarea when the backlight control condition is met so as to enable the backlight brightness value of continuous N frames of images starting from the image to be displayed to be monotonously changed when the continuous N frames of images are displayed in the backlight subarea, wherein N is a positive integer greater than 0.
10. The apparatus of claim 9, wherein the backlight control unit is specifically configured to:
if the backlight source state is that the backlight source is closed, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value required when the continuous N frames of images starting from the image to be displayed are displayed in the backlight subarea to be monotonically decreased;
and if the backlight source state is that the backlight source is started, setting the backlight source brightness value of the image to be displayed in the backlight subarea so as to enable the backlight source brightness value of the continuous N frames of images starting from the image to be displayed to be monotonically increased when the images are displayed in the backlight subarea.
11. The apparatus according to claim 10, wherein if the backlight status is backlight off, the backlight control unit is specifically configured to:
and forming an arithmetic progression by the backlight source brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and takes one minus N-th of the backlight source brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a tolerance.
12. The apparatus according to claim 10, wherein if the backlight status is backlight on, the backlight control unit is specifically configured to:
determining the backlight source brightness value of the backlight subarea when the image to be displayed is displayed;
and forming an arithmetic progression by the backlight brightness values of the N frames of images in the backlight subarea, wherein the arithmetic progression takes the backlight brightness value of the image to be displayed in the backlight subarea when the previous frame of image is displayed as a first item, and one-N of the backlight brightness values of the backlight subarea when the image to be displayed is displayed as a tolerance.
13. The apparatus according to claim 9, wherein the backlight source state determining unit is specifically configured to:
and judging whether to display the image to be displayed in the display screen in a wide-screen movie display mode.
14. The apparatus according to claim 13, wherein the backlight source state determining unit is specifically configured to:
acquiring the image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is a black area at the top of the display screen, and the second area is a black area at the bottom of the display screen;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, and the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, wherein the second threshold value is larger than 0;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
15. The apparatus according to claim 13, wherein the backlight source state determining unit is specifically configured to:
acquiring an image to be displayed, and determining a first image of the image to be displayed, which is displayed in a first area of a display screen, and a second image of the image to be displayed, which is displayed in a second area of the display screen, wherein the first area is an area corresponding to a black area at the top of the display screen, and the second area is an area corresponding to a black area at the bottom of the display screen;
acquiring a display mode of the first M continuous frames of images to be displayed, wherein M is a positive integer greater than 0;
acquiring pixel gray-scale values of pixels in the first image and the second image;
if the average pixel gray-scale values of all pixels in the first image and the second image are smaller than a first threshold value, the first threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
or the average pixel gray-scale value of all pixels in the first image is smaller than a first threshold value, the proportion of the number of pixels with pixel gray-scale values of 0 in the second image is larger than a second threshold value, the second threshold value is larger than 0, and the M continuous images are displayed in a wide-screen movie display mode;
the image to be displayed is judged to be displayed in the wide-screen movie display mode.
16. The apparatus of claim 14 or 15, wherein the backlight control unit is further configured to:
and closing the backlight source of the backlight subarea corresponding to the first area, judging whether the subtitles are displayed in the second area, and if the subtitles are not displayed, closing the backlight source of the backlight subarea corresponding to the second area.
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CN201710136155.1A CN106652924B (en) 2014-08-28 2014-08-28 Into or backlight control method and device when exiting wide-screen film display pattern
US14/547,508 US10165217B2 (en) 2014-08-28 2014-11-19 Backlight source control method of display device, display device and storage medium
US16/206,254 US10965898B2 (en) 2014-08-28 2018-11-30 Backlight source control method of display device, display device and storage medium

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