CN107240376A - Method for controlling backlight thereof, device and liquid crystal display - Google Patents
Method for controlling backlight thereof, device and liquid crystal display Download PDFInfo
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- CN107240376A CN107240376A CN201710550076.5A CN201710550076A CN107240376A CN 107240376 A CN107240376 A CN 107240376A CN 201710550076 A CN201710550076 A CN 201710550076A CN 107240376 A CN107240376 A CN 107240376A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 30
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- 238000005516 engineering process Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of method for controlling backlight thereof, device and liquid crystal display, wherein, this method includes：Positional information based on the highlight window recognized from display image determines backlight subarea to be adjusted, and opens the peak brightness function of backlight subarea；If in the display image corresponding to the backlight subarea of peak brightness function is had turned on it is unidentified go out highlight window positional information, the peak brightness function of backlight subarea is then closed, and controls the peak brightness function of backlight subarea to be remained turned-off in the first preset time period.The technical scheme that the present invention is provided can effectively prevent the lamp bar of backlight subarea to be in peak state, the occurrence of causing temperature rise exceeded and then cause light conducting board from deformation for a long time.
Description
Technical field
Set the present invention relates to technical field of liquid crystal display, more particularly to a kind of method for controlling backlight thereof, device and liquid crystal display
It is standby.
Background technology
At present, common TV has straight-down negative LED (Direct Light Emitting Diode, DLED) structures and side
Enter formula LED (Edge Light Emitting Diode, ELED) structure, the TV of wherein DLED structures is in liquid crystal panel
The back side is uniformly distributed LED；The TV of ELED structures is the edge mounted LED lamp in liquid crystal panel, light guide plate of arranging in pairs or groups,
When LED backlight subregion is lighted, the light of face plate edge is transported to the region in liquid crystal panel center by light guide plate, makes liquid crystal panel
It is integrated with enough amount of backlight and carrys out display picture.Compared to the TV of DLED structures, the TV of ELED structures is more frivolous, therefore more
Liked to get over by consumer.
Ultra high-definition high-order (Ultra High Definition Premium, UHD Premium) certification is that UHD alliances carry
Whether the UHD product standards of new generation gone out, certification examination product meets 4K ultra high-definitions standard, whether supports high dynamic illumination wash with watercolours
Whether dye (High-Dynamic Range, HDR) technology, peak brightness can reach that can 1000 nits (nits), colour gamut reach
90%DCI-P3 etc. is arrived, the ultra high-definition standard has become a main trend of consumer electronics industry.
Requirement of the ultra high-definition certification to product is higher, especially on this, recognizes in peak brightness to peak brightness
, it is necessary to which lamp bar keeps peak brightness state for a long time during card.But, for the TV of ELED structures, use LED light bar
As light emitting source, single lamp bar LED particle distribution density is big, and caloric value is big when using；And due to the limitation of backlight framework, dissipate
Heat also has certain limitation.Therefore, lamp bar works long hours in peak brightness state, and the temperature rise for being easily caused lamp bar is exceeded
In thermal design value, and temperature rise is exceeded is easily caused light conducting board from deformation, influences optical property.
The content of the invention
In view of this, the present invention provides a kind of method for controlling backlight thereof, device and liquid crystal display, for preventing lamp bar temperature
Rise exceeded.
To achieve the above object, aspect to be adjusted, the present invention provides a kind of method for controlling backlight thereof, including：
Positional information based on the highlight window recognized from display image determines backlight subarea to be adjusted, and opens
The peak brightness function of backlight subarea to be adjusted；
If in have turned on the display image corresponding to the backlight subarea of peak brightness function it is unidentified go out highlight window
Positional information, then close the peak brightness function of backlight subarea, and controls the peak brightness function of backlight subarea default first
Remained turned-off in period.
As a kind of optional embodiment of the present invention, this method also includes：
When the peak brightness function opening of backlight subarea is kept to the second preset time period, backlight subarea is closed
Peak brightness function.
As a kind of optional embodiment of the present invention, the positional information of highlight window is recognized from display image, specifically
Including：
Obtain the average picture level APL and brightness histogram of display image；
Judge whether APL meets the corresponding APL features of highlight window；
If APL meets the corresponding APL features of highlight window, judge whether brightness histogram meets highlight window corresponding
Brightness histogram feature；
If brightness histogram meets the corresponding brightness histogram feature of highlight window, according to the RGB information of display image
Identify the positional information of highlight window.
As a kind of optional embodiment of the present invention, the peak brightness function of backlight subarea to be adjusted is opened, specifically
Including：
Calculate the corresponding brightness value in each backlight subarea；
According to brightness value by the brightness adjustment of backlight subarea to be adjusted to peak brightness.
As a kind of optional embodiment of the present invention, according to brightness value by the brightness adjustment of backlight subarea to be adjusted extremely
Peak brightness, is specifically included：
Judge whether backlight subarea to be adjusted meets peak brightness regularization condition according to brightness value；Peak brightness adjusts bar
Part is used to indicate whether backlight subarea to be adjusted can carry out peak brightness adjustment；
If backlight subarea to be adjusted meets peak brightness regularization condition, by the brightness adjustment of backlight subarea to be adjusted
To peak brightness.
Second aspect, the present invention provides a kind of backlight control apparatus, including：
Highlight window identification module, the positional information for recognizing highlight window from display image；
Peak brightness control module, for the highlight window recognized based on highlight window identification module from display image
Positional information determine backlight subarea to be adjusted, and open the peak brightness function of backlight subarea to be adjusted；
Peak brightness control module, if being additionally operable to highlight window identification module is having turned on the backlight point of peak brightness function
In display image corresponding to area it is unidentified go out highlight window positional information, then close backlight subarea peak brightness function,
And control the peak brightness function of backlight subarea to be remained turned-off in the first preset time period.
As a kind of optional embodiment of the present invention, peak brightness control module is additionally operable to：
When the peak brightness function opening of backlight subarea is kept to the second preset time period, backlight subarea is closed
Peak brightness function.
As a kind of optional embodiment of the present invention, highlight window identification module, specifically for：
Obtain the average picture level APL and brightness histogram of display image；
Judge whether APL meets the corresponding APL features of highlight window；
If APL meets the corresponding APL features of highlight window, judge whether brightness histogram meets highlight window corresponding
Brightness histogram feature；
If brightness histogram meets the corresponding brightness histogram feature of highlight window, according to the RGB information of display image
Determine the positional information of highlight window.
As a kind of optional embodiment of the present invention, the peak brightness function side of backlight subarea to be adjusted is being opened
Face, peak brightness control module specifically for：
Calculate the corresponding brightness value in each backlight subarea；
According to brightness value by the brightness adjustment of backlight subarea to be adjusted to peak brightness.
As a kind of optional embodiment of the present invention, according to brightness value by the brightness adjustment of backlight subarea to be adjusted
To in terms of peak brightness, peak brightness control module specifically for：
Judge whether backlight subarea to be adjusted meets peak brightness regularization condition according to brightness value；Peak brightness adjusts bar
Part is used to indicate whether backlight subarea to be adjusted can carry out peak brightness adjustment；
If backlight subarea to be adjusted meets peak brightness regularization condition, by the brightness adjustment of backlight subarea to be adjusted
To peak brightness.
The third aspect, the present invention provides a kind of liquid crystal display, including：Liquid crystal panel, backlight assembly and any of the above-described
Backlight control apparatus described in embodiment.
Method for controlling backlight thereof, device and liquid crystal display that the present invention is provided, by monitoring in real time in display image
Highlight window, the positional information based on the highlight window identified determines backlight subarea to be adjusted, opens the backlight subarea
Peak brightness function；When have turned in the display image corresponding to the backlight subarea of peak brightness function it is unidentified go out highlight window
Positional information, that is, when the corresponding highlight window in backlight subarea for having turned on peak brightness function disappears, close the backlight subarea
Peak brightness function, and control the peak brightness function of the backlight subarea to be remained off in the first preset time period,
Prevent the lamp bar of backlight subarea to be in peak state for a long time, cause temperature rise exceeded and then cause the hair of light conducting board from deformation situation
It is raw.
Brief description of the drawings
Fig. 1 is a kind of application scenarios schematic diagram of the method for controlling backlight thereof of the offer of the present invention；
Fig. 2 is another application scenarios schematic diagram of the method for controlling backlight thereof of the offer of the present invention；
The schematic flow sheet for the method for controlling backlight thereof that Fig. 3 provides for the present invention；
The schematic flow sheet of the positional information for the identification highlight window that Fig. 4 provides for the present invention；
The schematic flow sheet for the peak brightness function of opening backlight subarea to be adjusted that Fig. 5 provides for the present invention；
Fig. 6 for the present invention provide according to brightness value by the stream of the brightness adjustment of backlight subarea to be adjusted to peak brightness
Journey schematic diagram；
Fig. 7 is the ELED TVs of single long backing structure；
Fig. 8 is the schematic flow sheet of horizontal direction ultra high-definition authentication method；
Fig. 9 is the ELED TVs of double short backing structures；
Figure 10 is the schematic flow sheet of vertical direction ultra high-definition authentication method；
The backlight control apparatus structural representation that Figure 11 provides for the present invention；
The structural representation for the liquid crystal display that Figure 12 provides for the present invention.
Embodiment
Worked long hours for lamp bar in the prior art in peak brightness state, be easily caused lamp bar temperature rise it is exceeded in
Thermal design value, and temperature rise is exceeded is easily caused light conducting board from deformation, influences the technical problem of optical property, and the present invention provides a kind of
Method for controlling backlight thereof, device and liquid crystal display, mainly by monitoring the highlight window in display image in real time, based on identification
The positional information of the highlight window gone out determines backlight subarea to be adjusted, the peak brightness function of the backlight subarea is opened, when
Open peak brightness function backlight subarea corresponding to display image in it is unidentified go out highlight window positional information, that is, monitor
When highlight window into the backlight subarea for having turned on peak brightness function disappears, the peak brightness work(of the backlight subarea is closed
Can, and control the peak brightness function of the backlight subarea to be remained off in the first preset time period, prevent backlight subarea
Lamp bar for a long time be in peak state, the occurrence of causing temperature rise exceeded and then cause light conducting board from deformation.
Application scenarios of the invention are first briefly explained below.
The system architecture of current television equipment mainly includes two kinds, respectively as depicted in figs. 1 and 2.
Fig. 1 is a kind of application scenarios schematic diagram of the method for controlling backlight thereof of the offer of the present invention, as shown in figure 1, liquid crystal
Show that equipment (such as TV) includes on-chip system (System On Chip, SOC), frame-rate conversion (Frame Rate
Conversion, FRC), backlight drive board, timer/counter control register (Timer Control register,
) and panel (Panel) Tcon.Wherein, the back side of panel has multiple backlight subarea (not shown), and SOC and FRC are used for display
Image is handled, and the image processing data that backlight drive board is used to be sent according to SOC and FRC controls the bright of each backlight subarea
Degree, Tcon is shown for display image to be delivered into panel according to default sequential.Pass through between SOC and backlight drive board
Internal integrated circuit bus (Inter-Integrated Circuit, I2C) is connected, and passes through string between FRC and backlight drive board
Row Peripheral Interface (Serial Peripheral Interface, SPI) bus and I2C connections.
Fig. 2 is another application scenarios schematic diagram of the method for controlling backlight thereof of the offer of the present invention, the liquid crystal shown in Fig. 2
Show that the system architecture of equipment is similar with Fig. 1, be with Fig. 1 difference, in Fig. 2, television equipment does not include FRC, SOC and the back of the body
Pass through serial spi bus and I2C connections between optical drive plate.
Below in conjunction with the accompanying drawings, embodiments of the invention are described.
The schematic flow sheet for the method for controlling backlight thereof that Fig. 3 provides for the present invention, as shown in figure 3, the back of the body that the present embodiment is provided
Light control method comprises the following steps：
S101, the positional information based on the highlight window recognized from display image determine backlight subarea to be adjusted,
And open the peak brightness function of backlight subarea to be adjusted.
Wherein, the corresponding backlight subarea of display image that highlight window is used to represent in highlight window needs to adjust to peak value
Brightness.For example：There is the window for carrying out ultra high-definition certification, the window is white window, it is necessary to by brightness adjustment extremely in display image
Peak brightness, the white window is highlight window；There is the sun or torch etc. to need the window being highlighted in display image, these
Window is high abatjour, and to be adjusted to peak value for the brightness of the backlight subarea corresponding to the display image in indication window
Brightness, that is, open the peak brightness function of backlight subarea to be adjusted.It should be noted that above-mentioned peak brightness not one fix
Brightness value, what it was represented is a brightness range, and the value for being greater than 1000nit, i.e. more than 1000nit represents that peak value is bright
Degree.
In the specifically positional information of identification highlight window, method shown in Fig. 4 is referred to.Fig. 4 present invention is provided
The schematic flow sheet of the positional information of highlight window is recognized, as shown in figure 4, the highlight window in identification display image, and really
When determining the position of highlight window, it can specifically be achieved by the steps of：
S201, the APL and brightness histogram for obtaining display image.
In the present embodiment, during liquid crystal display display image, each two field picture is required to by shown in Fig. 3
The method that embodiment is provided carries out backlight control processing.Backlight is carried out to any one frame display image with liquid crystal display below
Describe technical scheme exemplified by control process in detail.
Specifically, SOC (can be specifically post-processing module (PostProcess)) is when receiving display image, first
Display image is analyzed, average picture level (average picture level, APL) and brightness histogram is obtained
(Histogram) information, highlight window is recognized according to APL and Histogram values.
S202, judge whether APL meets the corresponding APL features of highlight window.
SOC first determines whether whether APL meets the corresponding APL features of highlight window after APL and Histogram is got.
For example：Judge whether APL is less than 40, if, then it represents that APL meets the corresponding APL features of highlight window, illustrates in display image
There may be highlight window；If not, then it represents that APL does not meet the corresponding APL features of highlight window, illustrates do not have in display image
There is highlight window, the APL for now then carrying out next frame judges.
If S203, APL meet the corresponding APL features of highlight window, judge whether brightness histogram meets highlight window
Corresponding brightness histogram feature.
If as described above, APL meets the corresponding APL features of highlight window, then it represents that may have in display image highlighted
Window, now SOC judge whether Histogram values meet the corresponding brightness histogram feature of highlight window.For example：Judge Nogata
Whether pixel accounting of the gray scale more than 192 exceedes certain threshold value in figure, if, then it represents that Histogram values meet highlight window
Corresponding brightness histogram feature, illustrates there is highlight window in display image；If not, then it represents that Histogram values are not met
The corresponding brightness histogram feature of highlight window, illustrates do not have highlight window in display image, now then carries out next frame
APL judges.
If S204, brightness histogram meet the corresponding brightness histogram feature of highlight window, according to the RGB of display image
Information determines the positional information of highlight window.
If as described above, brightness histogram meets the corresponding brightness histogram feature of highlight window, then it represents that display image
In have highlight window, now SOC the particular location of highlight window can be determined according to the RGB information of display image.Specifically
, the gray value in highlight window region is higher, is that can determine that high gray value according to the corresponding relation between rgb value and gray value
Pixel, and then the positional information of corresponding highlight window can be determined.
It should be noted that when recognizing highlight window, can also first judge that Histogram values judge APL, Huo Zhetong again
When judge Histogram values and APL, it is contemplated that APL judges relatively simple, and Installed System Memory occupancy is low, in the present embodiment preferably
Using first judging that APL judges that the method for Histogram values is identified again.
Specifically, each backlight subarea has corresponding image display area, the positional information of highlight window is being identified
Afterwards, you can corresponding backlight subarea to be adjusted is determined according to the positional information.SOC can be by the backlight with highlight window
Subregion and the partition information of other backlight subareas without highlight window are sent to the FRC in Fig. 1 or the backlight in Fig. 2 is driven
Dynamic plate, carries out after relevant treatment, the peak brightness function of the backlight subarea is opened by backlight drive board, makes the bright of the backlight subarea
Spend for peak brightness.
Opening the specific method of the peak brightness function of backlight subarea to be adjusted can be realized by method shown in Fig. 5.
The schematic flow sheet for the peak brightness function of opening backlight subarea to be adjusted that Fig. 5 provides for the present invention, as shown in figure 5, should
Method specifically may include steps of：
S301, the corresponding brightness value in each backlight subarea of calculating.
SOC by partition information after FRC or backlight drive board is sent to, FRC (for scene shown in Fig. 1) or SOC
(can be specifically the local dimming module (LocalDimming) inside SOC for scene shown in Fig. 2) be to each backlight subarea
Corresponding display image is analyzed, and is calculated the corresponding brightness value in each backlight subarea, is sent the brightness value by spi bus
To backlight drive board.
S302, according to brightness value by the brightness adjustment of backlight subarea to be adjusted to peak brightness.
Backlight drive board is received after the brightness value, according to the brightness value by the brightness adjustment of backlight subarea to be adjusted extremely
Peak brightness, to open the peak brightness function of backlight subarea to be adjusted.As described in step S100, the peak brightness is for example
Can be that more than 1000nit value represents peak brightness.
In specific adjustment, it can be realized by method shown in Fig. 6.Fig. 6 will treat for what the present invention was provided according to brightness value
The brightness adjustment of the backlight subarea of adjustment to peak brightness schematic flow sheet, as shown in fig. 6, step S302 can specifically include
Following steps：
S401, according to brightness value judge whether backlight subarea to be adjusted meets peak brightness regularization condition.
Wherein, peak brightness regularization condition is used to indicate whether backlight subarea to be adjusted can carry out peak brightness tune
It is whole.
For example：FRC or SOC determines to adjust when by the brightness of backlight subarea to be adjusted according to the brightness value of each backlight subarea
During whole (such as 1000nit) to highest peak brightness, power exceedes threshold power, then it represents that backlight to be adjusted point
Area is unsatisfactory for peak brightness regularization condition, now, then the peak brightness function of backlight subarea to be adjusted is not turned on, to prevent electricity
Source power is too high and influences overall performance；Conversely, determining to work as the brightness adjustment of backlight subarea to be adjusted to minimum peak value
During brightness, power is no more than predetermined power, then it represents that backlight subarea to be adjusted meets peak brightness regularization condition, this
When, then by I2C buses to backlight drive board transmission control signal backlight drive board can be made to open backlight subarea to be adjusted
Peak brightness function.
If S402, backlight subarea to be adjusted meet peak brightness regularization condition, by the bright of backlight subarea to be adjusted
Degree is adjusted to peak brightness.
When opening the peak brightness function of backlight subarea to be adjusted, FRC or SOC can be according to each backlight subareas
Brightness and the threshold power of power determine the peak-peak brightness of backlight subarea to be adjusted, by the back of the body to be adjusted
The peak brightness adjusted value of light subregion is sent to backlight drive board by I2C buses；Backlight drive board is by by the back of the body to be adjusted
The brightness adjustment of light subregion opens the peak brightness function of backlight subarea to be adjusted to peak brightness.Wherein, after adjustment
The peak brightness of backlight subarea is more than or equal to minimum peak brightness and is less than or equal to above-mentioned peak-peak brightness.
In specific adjustment, backlight drive board can be by adjusting electric current and/or pulse width modulation (Pulse Width
Modulation, PWM) mode by the brightness adjustment of backlight subarea to be adjusted to peak brightness.
It should be noted that SOC is after the backlight drive board that partition information is sent in Fig. 2, it can also be driven by backlight
Micro-control unit (Microcontroller Unit, MCU) in dynamic plate completes brightness value and calculates and adjust.
If S102, in the display image corresponding to the backlight subarea of peak brightness function is had turned on it is unidentified go out high abatjour
The positional information of mouth, then close the peak brightness function of backlight subarea, and controls the peak brightness function of backlight subarea first
Remained turned-off in preset time period.
Specifically, over time, having turned on the corresponding image display area in backlight subarea of peak brightness function
In highlight window all or part of can disappear, that is, having turned on the display image corresponding to the backlight subarea of peak brightness function
In it is unidentified go out highlight window positional information, for example：When carrying out ultra high-definition certification, highlight window is moved to other backlights point
Area, the highlight window having turned in the corresponding image display area in backlight subarea of peak brightness function all disappears, now, closes
Close the backlight subarea for all having turned on peak brightness function；In video playback, the sun or torch etc. are moved, and have turned on peak
It is worth the highlight window partial disappearance in the corresponding image display area in backlight subarea of brightness function, now, closing has turned on peak
It is worth a part for the backlight subarea of brightness function.
When the highlight window whole in the corresponding image display area in the backlight subarea for having turned on peak brightness function or portion
When dividing disappearance, FRC or SOC can send control message to backlight drive board, backlight drive board closing is had turned on peak value bright
The peak brightness function of the backlight subarea of function is spent, and increases guard time (the first preset time period), within this time not
The peak brightness function of the backlight subarea can be again turned on, to prevent the lamp bar of the backlight subarea to be in peak state for a long time,
The occurrence of causing temperature rise exceeded and then cause light conducting board from deformation.Wherein, the first preset time period can be more than or equal to 40 seconds
And less than or equal to 60 seconds, occurrence can be set according to actual needs, and the present embodiment is not particularly limited.
In specific adjustment, similar with the mode for opening peak brightness function, backlight drive board can be by adjusting electric current
And/or the mode of pulse width modulation (Pulse Width Modulation, PWM) will have turned on the backlight of peak brightness function
The brightness adjustment of subregion to minimum peak brightness (such as 1000nit) below.
Optionally, the method that the present embodiment is provided can also comprise the following steps：
When the peak brightness function opening of backlight subarea is kept to the second preset time period, backlight subarea is closed
Peak brightness function.
Under normal circumstances, the highlight window in display image will not typically rest on a position for a long time, in only a few
In the case of, there is a situation where that highlight window rests on a position for a long time, (second is pre- at this point it is possible to set a residence time
If the period), when more than second preset time period, then peak brightness function is closed, while, increase similar with step S102
The guard time of first preset time period.In addition, similar with the situation in step S102, the highlight window region that do not disappear is corresponding
Backlight subarea is probably the whole backlight subarea for having turned on peak brightness function, it is also possible to have turned on the back of the body of peak brightness function
A part for light subregion.
Wherein, the second preset time period can be more than or equal to 30 seconds and be less than or equal to 45 seconds, can be set slightly during specific setting
Big value, such as when carrying out ultra high-definition certification, the authenticated time of each backlight subarea is 30S, in order to ensure the accurate of certification
Property and reliability, can have more the certification surplus of 15 seconds, the second preset time period is set to 45 seconds.
The TV of ELED structures includes two kinds of structures：Single long backing structure and double short backing structures, are tied with both below
Illustrate beneficial effects of the present invention exemplified by structure.
Fig. 7 is the ELED TVs of single long backing structure, as shown in fig. 7, LED light bar is located at the bottom of liquid crystal panel, liquid crystal
Panel is divided into 6 backlight subareas, and each backlight subarea relies on corresponding LED light bar luminescence display.Recognize carrying out ultra high-definition
During card, then it is authenticated using horizontal direction authentication method, Fig. 8 is the schematic flow sheet of horizontal direction ultra high-definition authentication method,
As shown in figure 8, highlight window stops 30s, and circulated successively in a-quadrant, B regions, C regions.
When highlight window is in a-quadrant, is calculated, such as passed through by the analysis at SOC or FRC or backlight drive board end
SOC is analyzed, and first judges that APL meets highlight window feature, then judge that Histogram meets highlight window by Histogram
Feature, then rgb signal is judged, position of the highlight window in the leftmost side is got, two of the corresponding leftmost side are determined
Backlight subarea meets peak brightness regularization condition, and SOC is by this information transfer to backlight drive board, and backlight drive board is by adjusting electricity
Stream and/or PWM mode bring up to the backlight of the backlight subarea where a-quadrant maximum or more than 1000nit brightness, together
When SOC start to clock, control the leftmost side lamp bar under peak brightness state be no more than 45s, it is ensured that peak brightness it is lasting when
Between meet 30s requirement.
When highlight window is moved to B regions, SOC controls backlight drive board by the backlight of two backlight subareas of the leftmost side
Below 1000nit brightness is reduced to, and increases 60s guard time, prevents that the lamp bar of two backlight subareas of the leftmost side is long
Time is in peak state, the occurrence of causing temperature rise exceeded and then cause light conducting board from deformation.Simultaneously for B regions, at it
Handling process when reason flow appears in a-quadrant with highlight window is consistent.
When highlight window is moved to C regions, handling process is consistent with A with B regions.
Fig. 9 is the ELED TVs of double short backing structures, as shown in figure 9, LED light bar is located at the bottom of liquid crystal panel, liquid crystal
Panel is divided into 2*6 backlight subarea, and each backlight subarea relies on corresponding LED light bar luminescence display.Carrying out ultra high-definition
During certification, then it is authenticated using vertical direction authentication method, Figure 10 illustrates for the flow of vertical direction ultra high-definition authentication method
Figure, as shown in Figure 10, highlight window stops 30s, and circulated successively in a-quadrant, B regions, C regions.
When highlight window is in a-quadrant, calculated by the analysis at SOC or FRC or backlight drive board end, it is determined that correspondence
Four backlight subareas of top side meet peak brightness regularization condition, SOC drives this information transfer to backlight drive board, backlight
Dynamic plate by way of adjusting electric current and/or PWM by the backlight of the backlight subarea where a-quadrant bring up to it is maximum or
More than 1000nit brightness, while SOC starts to clock, controls the lamp bar of the leftmost side to be no more than 45s under peak brightness state,
Ensure that the duration of peak brightness meets 30s requirement.
When highlight window is moved to B regions, SOC controls backlight drive board by four back ofs the body of the corresponding top side in a-quadrant
The backlight of light subregion is reduced to below 1000nit brightness, and increases 60s guard time, prevents four backlights of top side
The lamp bar of subregion is in peak state, the occurrence of causing temperature rise exceeded and then cause light conducting board from deformation for a long time.Meanwhile, it is right
In B regions, handling process when its handling process appears in a-quadrant with highlight window is consistent.
When highlight window is moved to C regions, handling process is consistent with A with B regions.
The method for controlling backlight thereof that the present embodiment is provided, by monitoring the highlight window in display image in real time, based on identification
The positional information of the highlight window gone out determines backlight subarea to be adjusted, opens the peak brightness function of the backlight subarea；When
Open peak brightness function backlight subarea corresponding to display image in it is unidentified go out highlight window positional information, that is, opened
When the corresponding highlight window in backlight subarea for opening peak brightness function disappears, the peak brightness function of the backlight subarea is closed, and
Control the peak brightness function of the backlight subarea to be remained off in the first preset time period, prevent the lamp bar of backlight subarea
Peak state, the occurrence of causing temperature rise exceeded and then cause light conducting board from deformation are in for a long time.
The backlight control apparatus structural representation that Figure 11 provides for the present invention, the backlight control apparatus that the present embodiment is provided can
To be integrated in inside liquid crystal display, can specifically be realized by hardware and/software, such as by SOC, FRC in Fig. 1 and
Backlight drive board is realized jointly, or is realized jointly by SOC in Fig. 2 and backlight drive board.As shown in figure 11, the present embodiment is carried
The device of confession includes：Highlight window identification module 110 and peak brightness control module 120, wherein：
Highlight window identification module 110, the positional information for recognizing highlight window from display image；
Peak brightness control module 120, for the height recognized based on highlight window identification module 110 from display image
The positional information of abatjour mouthful determines backlight subarea to be adjusted, and opens the peak brightness function of backlight subarea to be adjusted；
Peak brightness control module 120, if being additionally operable to highlight window identification module 110 is having turned on peak brightness function
In display image corresponding to backlight subarea it is unidentified go out highlight window positional information, then close backlight subarea peak brightness
Function, and control the peak brightness function of backlight subarea to be remained turned-off in the first preset time period.
As an alternative embodiment, peak brightness control module 120, is additionally operable to：
When the peak brightness function opening of backlight subarea is kept to the second preset time period, backlight subarea is closed
Peak brightness function.
As a kind of specific embodiment, highlight window identification module 110 is known, specifically for：
Obtain the average picture level APL and brightness histogram of display image；
Judge whether APL meets the corresponding APL features of highlight window；
If APL meets the corresponding APL features of highlight window, judge whether brightness histogram meets highlight window corresponding
Brightness histogram feature；
If brightness histogram meets the corresponding brightness histogram feature of highlight window, according to the RGB information of display image
Determine the positional information of highlight window.
As a kind of specific embodiment, the peak brightness function aspects of backlight subarea to be adjusted, peak value are being opened
Brightness control module 120 specifically for：
Calculate the corresponding brightness value in each backlight subarea；
According to brightness value by the brightness adjustment of backlight subarea to be adjusted to peak brightness.
Further, according to brightness value by the brightness adjustment of backlight subarea to be adjusted to peak brightness in terms of, peak value
Brightness control module 120 specifically for：
Judge whether backlight subarea to be adjusted meets peak brightness regularization condition according to brightness value；Peak brightness adjusts bar
Part is used to indicate whether backlight subarea to be adjusted can carry out peak brightness adjustment；
If backlight subarea to be adjusted meets peak brightness regularization condition, by the brightness adjustment of backlight subarea to be adjusted
To peak brightness.
The backlight control apparatus that the present embodiment is provided can perform above method embodiment, its implementing principle and technical effect
Similar, here is omitted.
The structural representation for the liquid crystal display that Figure 12 provides for the present invention, as shown in figure 12, what the present embodiment was provided
Liquid crystal display includes：Backlight control apparatus 230 shown in liquid crystal panel 210, backlight assembly 220 and above-mentioned Figure 11.Wherein,
Backlight assembly 220 can include LED light bar, light guide plate etc..
The liquid crystal display that the present embodiment is provided can perform above method embodiment, its implementing principle and technical effect
Similar, here is omitted.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (11)
1. a kind of method for controlling backlight thereof, it is characterised in that including：
Positional information based on the highlight window recognized from display image determines backlight subarea to be adjusted, and opens described
The peak brightness function of backlight subarea to be adjusted；
If in the display image corresponding to the backlight subarea of peak brightness function is had turned on it is unidentified go out highlight window position
Information, then close the peak brightness function of the backlight subarea, and controls the peak brightness function of the backlight subarea first
Remained turned-off in preset time period.
2. according to the method described in claim 1, it is characterised in that methods described also includes：
When the peak brightness function opening of the backlight subarea is kept to the second preset time period, the backlight point is closed
The peak brightness function in area.
3. method according to claim 1 or 2, it is characterised in that the position letter of highlight window is recognized from display image
Breath, is specifically included：
Obtain the average picture level APL and brightness histogram of the display image；
Judge whether the APL meets the corresponding APL features of the highlight window；
If the APL meets the corresponding APL features of the highlight window, judge whether the brightness histogram meets the height
The corresponding brightness histogram feature of abatjour mouthful；
If the brightness histogram meets the corresponding brightness histogram feature of the highlight window, according to the display image
RGB information identifies the positional information of the highlight window.
4. method according to claim 1 or 2, it is characterised in that the peak of the unlatching backlight subarea to be adjusted
It is worth brightness function, specifically includes：
Calculate the corresponding brightness value in each backlight subarea；
According to the brightness value by the brightness adjustment of the backlight subarea to be adjusted to peak brightness.
5. method according to claim 4, it is characterised in that it is described according to the brightness value by the backlight to be adjusted
The brightness adjustment of subregion is specifically included to peak brightness：
Judge whether the backlight subarea to be adjusted meets peak brightness regularization condition according to the brightness value；The peak value is bright
Degree regularization condition is used to indicate whether the backlight subarea to be adjusted can carry out peak brightness adjustment；
If the backlight subarea to be adjusted meets peak brightness regularization condition, by the brightness of the backlight subarea to be adjusted
Adjust to peak brightness.
6. a kind of backlight control apparatus, it is characterised in that including：
Highlight window identification module, the positional information for recognizing highlight window from display image；
Peak brightness control module, for the highlight window recognized based on the highlight window identification module from display image
Positional information determine backlight subarea to be adjusted, and open the peak brightness function of the backlight subarea to be adjusted；
The peak brightness control module, if being additionally operable to the highlight window identification module is having turned on the back of the body of peak brightness function
In display image corresponding to light subregion it is unidentified go out highlight window positional information, then the peak value for closing the backlight subarea is bright
Function is spent, and controls the peak brightness function of the backlight subarea to be remained turned-off in the first preset time period.
7. device according to claim 6, it is characterised in that the peak brightness control module, is additionally operable to：
When the peak brightness function opening of the backlight subarea is kept to the second preset time period, the backlight point is closed
The peak brightness function in area.
8. the device according to claim 6 or 7, it is characterised in that the highlight window identification module, specifically for：
Obtain the average picture level APL and brightness histogram of the display image；
Judge whether the APL meets the corresponding APL features of the highlight window；
If the APL meets the corresponding APL features of the highlight window, judge whether the brightness histogram meets the height
The corresponding brightness histogram feature of abatjour mouthful；
If the brightness histogram meets the corresponding brightness histogram feature of the highlight window, according to the display image
RGB information determines the positional information of the highlight window.
9. the device according to claim 6 or 7, it is characterised in that opening the peak value of the backlight subarea to be adjusted
Brightness function aspects, the peak brightness control module specifically for：
Calculate the corresponding brightness value in each backlight subarea；
According to the brightness value by the brightness adjustment of the backlight subarea to be adjusted to peak brightness.
10. device according to claim 9, it is characterised in that according to the brightness value by the backlight to be adjusted
The brightness adjustment of subregion in terms of peak brightness, the peak brightness control module specifically for：
Judge whether the backlight subarea to be adjusted meets peak brightness regularization condition according to the brightness value；The peak value is bright
Degree regularization condition is used to indicate whether the backlight subarea to be adjusted can carry out peak brightness adjustment；
If the backlight subarea to be adjusted meets peak brightness regularization condition, by the brightness of the backlight subarea to be adjusted
Adjust to peak brightness.
11. a kind of liquid crystal display, it is characterised in that including：Any one of liquid crystal panel, backlight assembly and claim 6-10
Described backlight control apparatus.
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| CN201710550076.5A CN107240376A (en) | 2017-07-07 | 2017-07-07 | Method for controlling backlight thereof, device and liquid crystal display |
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| CN201710550076.5A CN107240376A (en) | 2017-07-07 | 2017-07-07 | Method for controlling backlight thereof, device and liquid crystal display |
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