CN101625843A - Backlight control method, backlight control device and LED liquid crystal display television - Google Patents
Backlight control method, backlight control device and LED liquid crystal display television Download PDFInfo
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- CN101625843A CN101625843A CN200910162133A CN200910162133A CN101625843A CN 101625843 A CN101625843 A CN 101625843A CN 200910162133 A CN200910162133 A CN 200910162133A CN 200910162133 A CN200910162133 A CN 200910162133A CN 101625843 A CN101625843 A CN 101625843A
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Abstract
The invention discloses a backlight control method, a backlight control device and an LED liquid crystal display television, which relate to the liquid crystal display technology, can effectively inhibit the action pseudomorphism of an image, and obviously improve the contrast of the image. The backlight control method provided by the embodiment of the invention comprises the following steps: receiving a signal of an image to be presented; carrying out frequency multiplication on the received image to obtain an image display signal; extracting brightness information of the image according to the image display signal; and presenting the image by using the image display signal and carrying out backlight control by using the brightness information. The invention is suitable for occasions carrying out liquid crystal display.
Description
Technical field
The present invention relates to lcd technology, relate in particular to a kind of method for controlling backlight thereof, device and LED LCD TV.
Background technology
LCD has entered huge numbers of families because advantage such as volume is light and handy, power consumption is little and radiation is low has obtained using widely as liquid crystal TV set.And backlight is as one of most important intraware in the LCD, for life-span of complete machine, performance, energy-conservation and aspect such as reduce cost huge meaning arranged all.Therefore, each main LCD TV producer, screen manufacturing enterprise and spare part enterprise all pay special attention to the development and the improvement of the technology of backlight.
Traditional LCD adopt usually cold-cathode fluorescence lamp (Cold Cathode FluorescentLamps, CCFL) as backlight, and CCFL can cause the LCD color abundant inadequately, the color rendition degree is poor.And light emitting diode (Light Emitting Diode LED) because dynamic range is wide, brightness is high, the life-span is long, working stability is reliable etc. advantage, replaces CCFL gradually by extensively as Backlight For Liquid Crystal Display Panels.
Yet, also there are image action artifact and two major defects of contrast less than when having now the LED liquid crystal display applications on televisor, also do not propose action artifact and the not enough problem of contrast that a sets of plan can solve the LCD TV image simultaneously in the prior art.
Summary of the invention
For solving problems of the prior art, embodiments of the invention provide a kind of method for controlling backlight thereof, device and LED LCD TV.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The embodiment of the invention provides a kind of method for controlling backlight thereof, and described method comprises:
The signal of the image that reception is to be presented;
The signal of the described image that receives is carried out frequency multiplication, obtain image display signal;
Extract the monochrome information of described image according to described image display signal;
Utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
Further, described method also comprises: by described image is carried out estimation and motion compensation, the signal of described image is carried out frequency multiplication, obtain image display signal.
Further, described method also comprises: described image division is at least two zones;
Extract each regional chrominance information of described image respectively according to described image display signal;
Utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
Wherein, described each regional chrominance information is each regional R, G, B signal,
The rgb value of described R, G, B signal correspondence is converted to the HSI value, the brightness in this HSI value is also preserved as described monochrome information.
Further, described method also comprises: described monochrome information is converted to backlight signal controlling value and preservation by predetermined ratio; Utilize described backlight signal controlling value to carry out backlight control.
The embodiment of the invention also provides a kind of backlight control apparatus, and described device comprises:
Signal receiving unit is used to receive the signal of image to be presented;
The frequency multiplication unit, the signal that is used for the described image that will receive carries out frequency multiplication, obtains image display signal;
The brightness extraction unit is used for extracting according to described image display signal the monochrome information of described image;
Present and backlight control unit, be used to utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
Wherein, described frequency multiplication unit also is used for by described image is carried out estimation and motion compensation, and the signal of described image is carried out frequency multiplication, obtains image display signal.
Described brightness extraction unit also comprises:
The area dividing module is used for described image division is at least two zones; The colourity extraction module is used for extracting each regional chrominance information of described image respectively according to described image display signal; The brightness calculation module is used to utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
Described presenting with backlight control unit also comprises:
Modular converter is used for described monochrome information being converted to the backlight signal controlling value by predetermined ratio and preserving;
Control module is used to utilize described backlight signal controlling value to carry out backlight control.
The embodiment of the invention also provides a kind of LED LCD TV, comprises above-mentioned backlight control apparatus.
From the above mentioned, the technical scheme that the embodiment of the invention provides, can carry out process of frequency multiplication at signal to image in, utilize the monochrome information of image to carry out dynamic backlight control.And the monochrome information owing to by image makes brightness backlight consistent with bright-dark degree in the image, has significantly improved the contrast of image.The technical scheme of the embodiment of the invention has solved problems of the prior art, can effectively suppress the action artifact of image, and significantly improves the contrast of image.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of method for controlling backlight thereof schematic flow sheet that Fig. 1 provides for the embodiment of the invention one;
The structural representation of a kind of backlight control apparatus that Fig. 2 provides for the embodiment of the invention three;
The structural representation of the LED LCD TV that Fig. 3 provides for the embodiment of the invention four;
The structural representation of frequency multiplication and dynamic area backlight control plate in the LED LCD TV that Fig. 4 provides for the embodiment of the invention four;
The workflow synoptic diagram of FPGA in the LED LCD TV that Fig. 5 provides for the embodiment of the invention four.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtained under the creative work prerequisite.
The embodiment of the invention one provides a kind of method for controlling backlight thereof, and as shown in Figure 1, described method comprises:
Step 11: the signal that receives image to be presented;
Step 12: the signal of the described image that will receive carries out frequency multiplication, obtains image display signal;
Step 13: the monochrome information of extracting described image according to described image display signal;
Step 14: utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
From the above mentioned, the technical scheme that the embodiment of the invention provides, can carry out process of frequency multiplication at signal to image in, utilize the monochrome information of image to carry out dynamic backlight control.And the monochrome information owing to by image makes brightness backlight consistent with bright-dark degree in the image, has significantly improved the contrast of image.The technical scheme of the embodiment of the invention has solved problems of the prior art, can effectively suppress the action artifact of image, and significantly improves the contrast of image.
The method for controlling backlight thereof that the embodiment of the invention two is provided describes below.Main in embodiments of the present invention is that example describes with the backlight control to the LED LCD TV, but is not limited to this, and this scheme also can be applicable in other the liquid crystal display device.
Step 21: the signal that receives image to be presented;
Under the different broadcast systems, the signal of image to be presented is also different, and for example, under the TSC-system formula, the signal of image can be 60Hz, and under pal mode, picture signal is generally 50Hz.Be that the situation of 60Hz is that example describes hereinafter with the picture signal that receives.
Step 22: the signal of the described image that will receive carries out frequency multiplication, obtains image display signal;
In the embodiment of the invention, the signal of described image is carried out two frequencys multiplication, the signal frequency multiplication that is about to the 60Hz image is to 120Hz, with the signal of this 120Hz as above-mentioned image display signal.Yet, as required, can regulate the concrete multiple of frequency multiplication.For example, can carry out quadruple to the signal of described image and handle, the signal frequency multiplication that is about to the 60Hz image is to 240Hz, with the signal of this 240Hz as above-mentioned image display signal.
Can carry out process of frequency multiplication by between two two field pictures that receive, adding at least one secondary black frame.Yet in order to obtain better visual effect, preferred, the embodiment of the invention is utilized estimation and motion compensation (MEMC) technology, by add at least one secondary compensated frame between two two field pictures that receive, realizes process of frequency multiplication.Because compensated frame is very close with original image (receiving original image) aspect picture material, the present invention has avoided image action artifact effectively by inserting compensated frame, even also can obtain effect preferably for the violent image of motion change.
Step 23: extract the monochrome information of described image according to described image display signal, specifically can comprise following processing:
Step 231: described image division is at least two zones;
Because each regional brightness is different in the image, in the embodiment of the invention monochrome information of zones of different in the image is extracted respectively, utilizes a plurality of monochrome informations to carry out backlight control when presenting piece image.
Can adopt unified partition mode, be the several regions of fixed size with each width of cloth image division; Perhaps, the picture frame bigger to similarity adopts identical division methods, when the difference between the image is big, reset the dividing region method, as the picture frame that belongs to Same Scene is adopted identical division methods, after the scene redirect, reset the region partitioning method of new picture frame.And the size in each zone can be identical in same width of cloth image, also can be different.
Step 232: extract each regional chrominance information of described image respectively according to described image display signal;
From the corresponding image display signal in each zone, extract each regional chrominance information of above-mentioned image,, adopt RGB (RGB) three primary colours model here, choose each regional R, G, B signal as this chrominance information.
Step 233: utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
In embodiments of the present invention, rgb color space is converted to hue, saturation, intensity (HSI) color space by the color space transformation algorithm, with the brightness I in the HSI color space as above-mentioned monochrome information.For example, following formula a kind of R of utilization, G, B signal correspondence be provided rgb value to calculate the method for above-mentioned each regional brightness I:
By above-mentioned processing, can accurately get access to the monochrome information of zones of different in the image, preserve this monochrome information, be used for the backlight control of subsequent process.
Step 24: utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
Convert the monochrome information of preserving to the backlight signal controlling value by predetermined ratio, as pulse-length modulation (PWM) signal controlling value, should predetermined ratio can be linear magnification ratio, also can be linear scale down, can also be non-linear proportion function.The backlight signal controlling value is write in the register of backlight driving chip respective regions.
With the above-mentioned image display signal that gets access to, as the picture signal of frequency multiplication to 120Hz, when sending into display screen and present, the backlight signal controlling value that reads in the register is carried out backlight control.Because the backlight signal controlling value has reflected each regional brightness of image exactly, makes brightness backlight to mate according to bright-dark degrees different in the image frame, has effectively improved contrast.
From the above mentioned, the technical scheme that the embodiment of the invention provides, can carry out process of frequency multiplication at signal to image in, utilize the monochrome information of image to carry out dynamic backlight control.And the monochrome information owing to by image makes brightness backlight consistent with bright-dark degree in the image, has significantly improved the contrast of image.The technical scheme of the embodiment of the invention has solved problems of the prior art, can effectively suppress the action artifact of image, and significantly improves the contrast of image.
The embodiment of the invention three also provides a kind of backlight control apparatus, and as shown in Figure 2, described device comprises:
Signal receiving unit 21 is used to receive the signal of image to be presented;
Present and backlight control unit 24, be used to utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
Further, described frequency multiplication unit 22 also is used for by described image is carried out estimation and motion compensation, and the signal of described image is carried out frequency multiplication, obtains image display signal.
Further, described brightness extraction unit 23 also comprises:
The area dividing module is used for described image division is at least two zones;
The colourity extraction module is used for extracting each regional chrominance information of described image respectively according to described image display signal;
The brightness calculation module is used to utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
Further, described presenting with backlight control unit 24 also comprises:
Modular converter is used for described monochrome information being converted to the backlight signal controlling value by predetermined ratio and preserving;
Control module is used to utilize described backlight signal controlling value to carry out backlight control.
The concrete method of work of each unit and module is referring to method embodiment of the present invention among apparatus of the present invention embodiment.
Above-mentioned each unit and module can be realized by independent chip, also can be integrated on one or more chips and realize.Above-mentioned backlight control apparatus can be applicable in LED LCD TV and other liquid crystal display devices.
The embodiment of the invention four also provides a kind of LED LCD TV, as shown in Figure 3, this LED LCD TV comprises above-mentioned backlight control apparatus, and this backlight control apparatus is integrated on frequency multiplication and the dynamic area backlight control plate realizes, be about to signal receiving unit, frequency multiplication unit, the brightness extraction unit of backlight control apparatus and present all be integrated on this frequency multiplication and the dynamic area backlight control plate with backlight control unit.This frequency multiplication and dynamic area backlight control plate can be a pcb board.Here, be that example describes still with the picture signal of 60Hz.
Wherein, referring to Fig. 4, provide the specific implementation method of a kind of frequency multiplication and dynamic area backlight control plate.The frequency multiplication unit can be realized by the MEMC chip that a slice be used for estimation and motion compensation, and brightness extraction unit and present with backlight control unit and can realize by a slice field programmable gate array (FPGA) chip.Further, the storage that a DDR storer is used for backlight control information and data can be set separately, for example, be used for the storage of monochrome information and be used for temporary etc. to estimation and motion compensation information.
Referring to Fig. 3 and Fig. 4, the picture signal that motherboard will receive from the 60Hz of signal source is sent to frequency multiplication and dynamic area backlight control plate, frequency multiplication and dynamic area backlight control plate receive this picture signal, can receive this picture signal by signal receiving unit as frequency multiplication and dynamic area backlight control plate.
Frequency multiplication and dynamic area backlight control plate arrive 120Hz with the picture signal of 60Hz through MEMC chip frequency multiplication, then the picture signal of the 120Hz after the frequency multiplication are sent into FPGA and handle.FPGA analyzes from the signal of MEMC chip input, extracts the monochrome information of each two field picture zones of different and is stored in the DDR storer.
FPGA converts the monochrome information of storage to the pwm signal controlling value according to certain ratio, and this pwm signal controlling value write register with the corresponding zones of different of backlight driving chip, carry out backlight control, simultaneously the 120HZ picture signal is sent into the liquid crystal display chip for driving and present, to reach synchronous that backlight control and image show.
Further, for clearly demonstrating the technical scheme of the embodiment of the invention,, the concrete method of work of above-mentioned FPGA is carried out following description referring to Fig. 5.
FPGA carries out color to the frequency multiplication that receives to the signal of 120Hz and extracts, and extracts R, G, the B signal of zones of different correspondence in the image, converts rgb color space to the HSI color space by the color space transformation algorithm.FPGA as the monochrome information that gets access to, and preserves the brightness in the HSI color space.Further, FPGA can also analyze and add up the monochrome information that gets access to, and according to the result who analyzes and add up current monochrome information is adjusted, and maybe the result that will analyze and add up is used for follow-up backlight control.
FPGA converts the monochrome information of preserving to the backlight signal controlling value by predetermined ratio, and as the pwm signal controlling value, this predetermined ratio can be linear magnification ratio, also can be linear scale down, can also be non-linear proportion function.FPGA, writes the backlight signal controlling value in the register of backlight driving chip respective regions by spi bus after temporary a period of time the pwm signal controlling value.
From the above mentioned, the technical scheme that the embodiment of the invention provides, can carry out process of frequency multiplication at signal to image in, utilize the monochrome information of image to carry out dynamic backlight control.And the monochrome information owing to by image makes brightness backlight consistent with bright-dark degree in the image, has significantly improved the contrast of image.The technical scheme of the embodiment of the invention has solved problems of the prior art, can effectively suppress the action artifact of image, and significantly improves the contrast of image.
Those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can software product form embody, this computer software product can be stored in the storage medium, as ROM/RAM, disk, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1, a kind of method for controlling backlight thereof is characterized in that, described method comprises:
The signal of the image that reception is to be presented;
The signal of the described image that receives is carried out frequency multiplication, obtain image display signal;
Extract the monochrome information of described image according to described image display signal;
Utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
2, method for controlling backlight thereof according to claim 1 is characterized in that, the signal of the described described image that will receive carries out frequency multiplication, obtains image display signal and comprises:
By described image is carried out estimation and motion compensation, the signal of described image is carried out frequency multiplication, obtain image display signal.
3, method for controlling backlight thereof according to claim 1 is characterized in that, the described monochrome information of extracting described image according to described image display signal specifically comprises:
Described image division is at least two zones;
Extract each regional chrominance information of described image respectively according to described image display signal;
Utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
4, method for controlling backlight thereof according to claim 3 is characterized in that, described each regional chrominance information is each regional R, G, B signal,
The rgb value of described R, G, B signal correspondence is converted to the HSI value, the brightness in this HSI value is also preserved as described monochrome information.
5, method for controlling backlight thereof according to claim 1 is characterized in that, describedly utilizes described monochrome information to carry out backlight control also to comprise:
Described monochrome information is converted to backlight signal controlling value and preservation by predetermined ratio;
Utilize described backlight signal controlling value to carry out backlight control.
6, a kind of backlight control apparatus is characterized in that, described device comprises:
Signal receiving unit is used to receive the signal of image to be presented;
The frequency multiplication unit, the signal that is used for the described image that will receive carries out frequency multiplication, obtains image display signal;
The brightness extraction unit is used for extracting according to described image display signal the monochrome information of described image;
Present and backlight control unit, be used to utilize described image display signal to present described image, and utilize described monochrome information to carry out backlight control.
7, backlight control apparatus according to claim 6 is characterized in that, described frequency multiplication unit also is used for by described image is carried out estimation and motion compensation, and the signal of described image is carried out frequency multiplication, obtains image display signal.
8, backlight control apparatus according to claim 6 is characterized in that, described brightness extraction unit also comprises:
The area dividing module is used for described image division is at least two zones;
The colourity extraction module is used for extracting each regional chrominance information of described image respectively according to described image display signal;
The brightness calculation module is used to utilize described chrominance information to calculate each regional monochrome information and preservation respectively.
9, backlight control apparatus according to claim 6 is characterized in that, described presenting with backlight control unit also comprises:
Modular converter is used for described monochrome information being converted to the backlight signal controlling value by predetermined ratio and preserving;
Control module is used to utilize described backlight signal controlling value to carry out backlight control.
10, a kind of LED LCD TV is characterized in that, comprises aforesaid right requirement 6 to 9 each described backlight control apparatus.
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| CN102184689A (en) * | 2011-04-15 | 2011-09-14 | 冠捷显示科技（厦门）有限公司 | Method and device for realizing multi-color LOGO display |
| CN102737610A (en) * | 2011-03-31 | 2012-10-17 | 青岛海信电器股份有限公司 | Method and apparatus for adjusting light source brightness, and display device |
| CN104700788A (en) * | 2015-04-01 | 2015-06-10 | 京东方科技集团股份有限公司 | Driving device of display panel and display panel |
| CN105187124A (en) * | 2015-09-28 | 2015-12-23 | 中国人民解放军信息工程大学 | Information transmission method and device based on backlight modulation |
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| EP1489590A4 (en) * | 2002-03-28 | 2008-07-23 | Matsushita Electric Ind Co Ltd | Liquid crystal display device |
| JP2008176211A (en) * | 2007-01-22 | 2008-07-31 | Hitachi Ltd | Liquid crystal display device and method of controlling brightness thereof |
| CN101315748B (en) * | 2007-05-31 | 2010-12-15 | 中华映管股份有限公司 | Driving mechanism and method of display equipment |
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| CN102737610A (en) * | 2011-03-31 | 2012-10-17 | 青岛海信电器股份有限公司 | Method and apparatus for adjusting light source brightness, and display device |
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| CN102184689A (en) * | 2011-04-15 | 2011-09-14 | 冠捷显示科技（厦门）有限公司 | Method and device for realizing multi-color LOGO display |
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| CN105187124A (en) * | 2015-09-28 | 2015-12-23 | 中国人民解放军信息工程大学 | Information transmission method and device based on backlight modulation |
| CN105187124B (en) * | 2015-09-28 | 2018-05-18 | 中国人民解放军信息工程大学 | A kind of information transferring method and device based on backlight modulation |
| CN105304029B (en) * | 2015-12-09 | 2018-05-08 | 青岛海信电器股份有限公司 | A kind of image processing method and liquid crystal display |
| CN105304029A (en) * | 2015-12-09 | 2016-02-03 | 青岛海信电器股份有限公司 | Image processing method and liquid crystal display |
| US10360868B2 (en) | 2015-12-09 | 2019-07-23 | Hisense Electric Co., Ltd. | Image processing method and liquid crystal display device |
| CN110503924A (en) * | 2019-07-31 | 2019-11-26 | 华勤通讯技术有限公司 | Content-adaptive method for controlling backlight thereof and electronic equipment |
| CN112669780A (en) * | 2020-12-31 | 2021-04-16 | 深圳Tcl数字技术有限公司 | Image display method, liquid crystal display device, apparatus, and storage medium |
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| CN114863888A (en) * | 2022-07-07 | 2022-08-05 | 苏州源泽物联科技有限公司 | Image display synchronization control system and synchronization control method thereof |
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