CN101667411A - Dynamic backlight control method and device - Google Patents
Dynamic backlight control method and device Download PDFInfo
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- CN101667411A CN101667411A CN200910181370A CN200910181370A CN101667411A CN 101667411 A CN101667411 A CN 101667411A CN 200910181370 A CN200910181370 A CN 200910181370A CN 200910181370 A CN200910181370 A CN 200910181370A CN 101667411 A CN101667411 A CN 101667411A
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Abstract
The invention relates to a dynamic backlight control method and a device, wherein the dynamic backlight control method adopts a single video processing chip and comprises the following steps that thevideo processing chip decodes and analyzes decoding output according to the configuration of a video image subarea array and extracts subarea backlight values; the video processing chip calibrates brightness according to the configuration of the video image subarea array; and the video processing chip outputs backlight by a periphery drive circuit.
Description
Technical field
The present invention relates to LCD TV and display, be specifically related to a kind of dynamic backlight control method and device.
Background technology
Most of at present television manufacturer is both at home and abroad all classified LCD TV as the terminal technology product, it possesses frivolous portable, rich color, resolution is big, sharpness is high, environmental protection, power consumption is low and advantage such as long service life, but the TV that contrasts other kinds is still having gap aspect contrast, the color saturation.For improving LCD TV in the performance aspect color, the contrast, technology according to image content dynamic-configuration backlight progressively appears in the industry, that is:, subregion dynamic backlight technology dynamic by the overall situation improves contrast, reduce power consumption, strengthen color saturation and stereovision by the color optimization technology, but the technical scheme of main flow all is to be the backlight design drive system separately at present, need design dynamic backlight sequential to cooperate like this, both increased system cost, be unfavorable for that also system realizes, is not easy to manage and later online upgrading simultaneously.
Summary of the invention
The technical issues that need to address of the present invention are, how a kind of dynamic backlight control method and device are provided, and can directly carry out dynamic backlight control with a slice master chip.
First technical matters of the present invention solves like this: make up a kind of dynamic backlight control method, adopt single video frequency processing chip, may further comprise the steps:
The decoding of described video frequency processing chip and according to video image subregion array Allocation Analysis decoding output, extract the subregion backlight value;
Described video frequency processing chip is configured into capable gamma correction according to video image subregion array;
Described video frequency processing chip is backlight by peripheral drive circuit output.
According to dynamic backlight control method provided by the invention, described analysis comprises the data space conversion, that is: RGB (RGB) data are changeed other spatial datas, mainly be statistics and processing for the subregion backlight value, the subregion backlight value is the monochrome information that has embodied subregion, RGB also contains monochrome information, but the statistical treatment inconvenience.
According to dynamic backlight control method provided by the invention, this dynamic backlight control method comprises that also described video frequency processing chip carries out image compensation and passes through the peripheral drive circuit output video image described decoding output in described processing backlight back.
According to dynamic backlight control method provided by the invention, this dynamic backlight control method also comprises according to the LCD Interface specification and disposes described peripheral drive circuit signal output format.
According to dynamic backlight control method provided by the invention, this dynamic backlight control method also comprises color or the gray scale of revising output video image.
Another technical matters of the present invention solves like this: make up a kind of dynamic backlight control device, be built in video frequency processing chip, comprising:
The gamma correction submodule is arranged in described video frequency processing chip digital signal processing module, is connected with decoding submodule in the digital signal processing module, is used for according to the subregion backlight value of video image subregion array configuration extraction decoding output and carries out gamma correction.
According to dynamic backlight control device provided by the invention, described digital signal processing module also comprises input interface submodule, colourity optimization submodule and output interface submodule, described input interface submodule is connected with described decoding submodule, described decoding submodule also connects described colourity and optimizes submodule, and described gamma correction submodule is optimized submodule with colourity and is connected described output interface submodule.
According to dynamic backlight control device provided by the invention, described output interface submodule is configurable output interface submodule, is used for according to LCD Interface specification configuration output signal form.
According to dynamic backlight control device provided by the invention, described gamma correction submodule comprises: subregion is added up brightness normalization coefficient unit, is used to add up the brightness normalization coefficient of each subregion of video image; Subregion correction brightness unit is connected with described subregion statistics brightness normalization coefficient unit, is used to revise the subregion brightness data; The drive signal output unit is connected with described subregion statistics brightness normalization coefficient unit, is used to export the subregion drive signal.
According to dynamic backlight control device provided by the invention, described drive signal is current level drive signal or pulse width modulated driving signal.
Dynamic backlight control method provided by the invention and device, directly realize dynamic backlight control by transforming LCD TV or display SOC (system on a chip) SoC, avoided independent backlight driving system and extra sequential to cooperate, be easy to manage and later online upgrading, thereby light and reduce Overall Power Consumption, improve the complete machine aspect of performance reducing circuit scale, dynamic backlight source control, have greatly improved, further can dispose configurable output interface module signal output format, can be widely used in various LCD TV or the display according to the LCD Interface specification.
Description of drawings
Fig. 1 is an embodiment of the invention liquid crystal TV set theory diagram;
Fig. 2 is the theory diagram of digital signal processing module in the embodiment liquid crystal TV set shown in Figure 1;
Fig. 3 is the theory diagram of gamma correction submodule in the embodiment digital signal processing module shown in Figure 2;
Fig. 4 is of the present invention dynamic backlight control method schematic flow sheet corresponding with embodiment liquid crystal TV set shown in Figure 1.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby protection scope of the present invention is made more explicit defining so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that.
As shown in Figure 1, in the liquid crystal TV set of the specific embodiment of the invention, SOC (system on a chip) 1 by a specific embodiment of the invention drives LCD MODULE and the process of dynamically lighting that realizes backlight, and the digital signal processing module in this SOC (system on a chip) 1 directly is connected with the display module that contains backlight.
As shown in Figure 2, digital signal processing module comprises input interface submodule, decoding submodule, gamma correction submodule, colourity optimization submodule and configurable output interface submodule in the SOC (system on a chip) 1 of the specific embodiment of the invention, its principle of work is: data are through the data of input interface submodule, decoding submodule output YUV coded format, process gamma correction submodule is modified to brightness data Y and satisfies electrically-erasable brightness data that program storage disposes, and corresponding pulse width modulation (PWM) signal output is arranged simultaneously; The chroma data UV colourity of flowing through is optimized submodule, makes chroma data obtain proofreading and correct.Final data is through configurable output interface submodule output.
As shown in Figure 3, the gamma correction submodule comprises subregion statistics brightness normalization coefficient unit, subregion correction brightness unit and PWM drive signal output unit in the digital signal processing module of the specific embodiment of the invention, its principle of work is: at first, subregion is added up the brightness normalization coefficient that each subregion is added up in brightness normalization coefficient unit under the control of CPU in the SOC (system on a chip) 1 of the specific embodiment of the invention, the result is deposited in storer, for the output of follow-up subregion gamma correction and PWM drive signal ready.Secondly, CPU reads storer in the SOC (system on a chip) 1 of the specific embodiment of the invention brightness data and corresponding brightness normalization coefficient are sent into subregion correction brightness unit, and one tunnel brightness normalization coefficient is sent into PWM drive signal output unit simultaneously.So the PWM drive signal of revised brightness data of subregion and corresponding subregion is input to configurable output interface submodule.EEPROM is the storer that subregion is dynamically controlled the thought write circuit in the SOC (system on a chip) 1 of the specific embodiment of the invention, and power supply one powers on, and CPU just reads the initialize routine of EEPROM, and CPU can be according to the dynamic control program work of the subregion of EEPROM then.
SOC (system on a chip) 1 replaceable original LCD TV SOC (system on a chip) of the specific embodiment of the invention, electrically-erasable program storage EEPROM control SOC (system on a chip) 1 innernal CPU work of the present invention by configuration SOC (system on a chip) of the present invention 1 inside, export the signal of the required form of LCD MODULE by the configurable interface module of configuration SOC (system on a chip) of the present invention 1 inside, wherein the EEPROM of the specific embodiment of the invention is the storer that subregion is dynamically controlled the thought write circuit, power supply one powers on, CPU just reads the initialize routine of EEPROM, CPU can be according to the dynamic control program work of the subregion of EEPROM then, and is specific as follows:
By the content of erasable original LCD TV SOC (system on a chip) EEPROM, revise the program of control LCD TV CPU work.Thereby how definition CPU controls other functional module work.
Data-signal is through the signal interface circuit module, converts data-signal the data-signal of yuv format to, passes through decoder module then.The synchronizing signal that obtains tells CPU to start working.
CPU control store storage data are controlled the work of subregion statistics brightness normalization coefficient module simultaneously, reading of data, and the result deposited in storer; Storer is used for the module of storage frame data and intermediate data.
CPU reads storer brightness data Y and delivers to subregion correction brightness module, reads corresponding brightness normalization coefficient and delivers to subregion correction brightness module and PWM output module, reads chroma data UV then and sends into the colourity optimal module.
Last CPU is revised brightness data YUV, and pwm signal is sent into the output of configurable interface module.
Further combined with example, suppose that now a frame image data is divided into N * N zone (certainly, when N=1, being overall dynamic mode).When CPU ran through the data in the 1st * 1 zone, subregion statistics brightness normalization coefficient module deposited the result in storer, and this moment, the data in the 1st * 1 zone also deposited storer in.So, 1 * 2 ...
When the data in 1 * 1 zone are sent subregion correction brightness module to, this module according to the brightness normalization coefficient in 1 * 1 zone to brightness correction, constant or improve to satisfy the subjective contrast.So, 1 * 2 ...
When the brightness normalization coefficient in 1 * 1 zone is delivered to the PWM output module, this module is sent into the configurable interface module according to the dutycycle of normalization coefficient adjusting fixed frequency, or directly output, or convert DC level to, in order to control the back light source brightness in 1 * 1 zone.So, 1 * 2 ...
When the UV data were sent into the colourity optimal module, the corrected parameter table good according to test in advance optimized chroma data, and the present invention only just can accomplish the overall situation or the design of subregion dynamic backlight with a slice signal processing chip like this.
At last, as shown in Figure 4, the disposal route backlight of specific embodiment of the invention liquid crystal TV set mainly comprises:
1, configuration step before use:
Video image is configured to even subregion array (row * row).Evenly the purpose of subregion array (row * row) is: by the corresponding control of LED subregion, improve the demonstration contrast, energy-conservation etc. of LED-backlit LCD TV.
Dynamic control model is set: energy-conservation, high-contrast does not have light leak, quasi real time adjustment backlight, boundary treatment, debugging static backlight isotype (or mode combinations); These patterns are set, and mainly are the needs of using for concrete.Debugging static backlight pattern:, do not make it as CCFL backlight control--Chang Liang to LED-backlit control; High-contrast does not have light leak, energy-conservation: the general objects that adopts LED subregion backlight control; Adjustment quasi real time backlight: control promptly backlight is corresponding with the present frame display image, the problem that solves common backlight control introducing (as: is but changed in the process in scene, the backlight control of next frame image and this frame is widely different, introduces the serious problem of dtmf distortion DTMF of image); Boundary treatment: because when the LED subregion is controlled, must introduce the halation problem (luminance difference of by stages) of by stages, cause the distortion of picture, boundary treatment mainly is to improve the luminance difference of by stages, or by LED-backlit compensation or by image compensation etc.
Ram table is powered on or the loading that resets (as computing RAM, arithmetic register, temperature optics RAM etc.).Ram table is powered on or the purpose that loads that resets is for follow-up concrete application.
The selection of image compensation is set.Mainly be in order to improve LED subregion halation problem.
2, system reset step:, each module is carried out initialization powering on or working during system reset.Because a period of time that powers on, system is unsettled.If there is not homing action, may when power on, make the state machine in some modules enter some wrong states, thereby cause the deadlock of system.
3, space conversion step: RGB changes other spaces.Mainly be statistics and the processing for the subregion backlight value, the subregion backlight value is the monochrome information that has embodied subregion, and RGB contains monochrome information, but the statistical treatment inconvenience.
4, analyze data, extraction subregion backlight value step: be configured into data statistic analysis in the capable subregion according to the subregion array, extract the backlight value of each subregion simultaneously.
5, carry out treatment step backlight according to configuration:
Carrying out the corresponding backlight value according to computing RAM, arithmetic register, temperature optics RAM and other control of configuration handles.For example: the computing that realizes that Y=X/5 is such is wanted in application at first, but that this computing of follow-up discovery need change to Y=X/3 is more reasonable.Like this, can adopt RAM to realize this kind computing, 1/5 or 1/3 of storage correspondence be changed more convenient.
6, output step backlight: externally output drives peripheral driver (I2C, SPI etc.).
7, image compensation: present image compensation is that subregion halation problem is carried out certain image compensation, or whole luminance compensation is adopted in the influence of subregion brightness, proofreaies and correct or the like as GAMMA.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work 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 that claims were limited.
Claims (10)
1, a kind of dynamic backlight control method is characterized in that, adopts single video frequency processing chip, may further comprise the steps:
The decoding of described video frequency processing chip and according to video image subregion array Allocation Analysis decoding output, extract the subregion backlight value;
Described video frequency processing chip is configured into capable gamma correction according to video image subregion array;
Described video frequency processing chip is backlight by peripheral drive circuit output.
According to the described dynamic backlight control method of claim 1, it is characterized in that 2, described analysis comprises the data space conversion.
3, according to the described dynamic backlight control method of claim 1, it is characterized in that this dynamic backlight control method comprises that also described video frequency processing chip carries out image compensation and passes through the peripheral drive circuit output video image described decoding output in described processing backlight back.
According to the arbitrary described dynamic backlight control method of claim 1 to 3, it is characterized in that 4, this dynamic backlight control method also comprises according to the LCD Interface specification and disposes described peripheral drive circuit signal output format.
According to the arbitrary described dynamic backlight control method of claim 1 to 3, it is characterized in that 5, this dynamic backlight control method also comprises color or the gray scale of revising output video image.
6, a kind of dynamic backlight control device is characterized in that, is built in video frequency processing chip, comprising:
The gamma correction submodule is arranged in described video frequency processing chip digital signal processing module, is connected with decoding submodule in the digital signal processing module, is used for according to the subregion backlight value of video image subregion array configuration extraction decoding output and carries out gamma correction.
7, according to the described dynamic backlight control device of claim 6, it is characterized in that, described digital signal processing module also comprises input interface submodule, colourity optimization submodule and output interface submodule, described input interface submodule is connected with described decoding submodule, described decoding submodule also connects described colourity and optimizes submodule, and described gamma correction submodule is optimized submodule with colourity and is connected described output interface submodule.
According to the described dynamic backlight control device of claim 7, it is characterized in that 8, described output interface submodule is configurable output interface submodule, be used for according to LCD Interface specification configuration output signal form.
According to the described dynamic backlight control device of claim 6, it is characterized in that 9, described gamma correction submodule comprises:
Subregion is added up brightness normalization coefficient unit, is used to add up the brightness normalization coefficient of each subregion of video image;
Subregion correction brightness unit is connected with described subregion statistics brightness normalization coefficient unit, is used to revise the subregion brightness data;
The drive signal output unit is connected with described subregion statistics brightness normalization coefficient unit, is used to export the subregion drive signal.
According to the described dynamic backlight control device of claim 9, it is characterized in that 10, described drive signal is current level drive signal or pulse width modulated driving signal.
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| CN2009101813709A CN101667411B (en) | 2009-07-10 | 2009-07-10 | Dynamic backlight control method and device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196294A (en) * | 2010-03-16 | 2011-09-21 | 康佳集团股份有限公司 | Signal processing method for stereoscopic television and stereoscopic television |
| CN102693699A (en) * | 2011-03-25 | 2012-09-26 | 三洋电机株式会社 | Display apparatus |
| CN103366686A (en) * | 2012-04-02 | 2013-10-23 | 纬创资通股份有限公司 | Display device, display method, and encoding method |
| CN103487964A (en) * | 2013-01-09 | 2014-01-01 | 京东方科技集团股份有限公司 | Real-time dynamic power consumption display device |
| TWI475553B (en) * | 2013-04-29 | 2015-03-01 | Wistron Corp | Backlight control module and backlight control method |
| CN105049836A (en) * | 2015-07-08 | 2015-11-11 | 四川长虹电器股份有限公司 | LED TV backlight partitioning rapid inspection method |
| CN105895054A (en) * | 2016-05-17 | 2016-08-24 | 深圳天珑无线科技有限公司 | Adjustment method of output brightness, adjustment method of Gamma curve and display device |
| CN105976770A (en) * | 2016-07-21 | 2016-09-28 | 深圳创维－Rgb电子有限公司 | Method for controlling dimming signal and device and system thereof |
| WO2018218947A1 (en) * | 2017-06-01 | 2018-12-06 | 青岛海信电器股份有限公司 | Backlight brightness control device and image 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 |
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2009
- 2009-07-10 CN CN2009101813709A patent/CN101667411B/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196294A (en) * | 2010-03-16 | 2011-09-21 | 康佳集团股份有限公司 | Signal processing method for stereoscopic television and stereoscopic television |
| CN102693699A (en) * | 2011-03-25 | 2012-09-26 | 三洋电机株式会社 | Display apparatus |
| CN103366686A (en) * | 2012-04-02 | 2013-10-23 | 纬创资通股份有限公司 | Display device, display method, and encoding method |
| CN103487964B (en) * | 2013-01-09 | 2016-03-30 | 京东方科技集团股份有限公司 | A kind of real-time dynamic power consumption display device |
| CN103487964A (en) * | 2013-01-09 | 2014-01-01 | 京东方科技集团股份有限公司 | Real-time dynamic power consumption display device |
| TWI475553B (en) * | 2013-04-29 | 2015-03-01 | Wistron Corp | Backlight control module and backlight control method |
| CN105049836A (en) * | 2015-07-08 | 2015-11-11 | 四川长虹电器股份有限公司 | LED TV backlight partitioning rapid inspection method |
| CN105049836B (en) * | 2015-07-08 | 2017-03-01 | 四川长虹电器股份有限公司 | The quick inspection method in LED television backlight subarea |
| CN105895054A (en) * | 2016-05-17 | 2016-08-24 | 深圳天珑无线科技有限公司 | Adjustment method of output brightness, adjustment method of Gamma curve and display device |
| CN105976770A (en) * | 2016-07-21 | 2016-09-28 | 深圳创维－Rgb电子有限公司 | Method for controlling dimming signal and device and system thereof |
| CN105976770B (en) * | 2016-07-21 | 2018-07-27 | 深圳创维－Rgb电子有限公司 | A kind of method, apparatus and system of control dim signal |
| WO2018218947A1 (en) * | 2017-06-01 | 2018-12-06 | 青岛海信电器股份有限公司 | Backlight brightness control device and image 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 |
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| CN101667411B (en) | 2012-02-22 |
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Address after: 266004 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Hisense Video Technology Co., Ltd Address before: 266004 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: HISENSE ELECTRIC Co.,Ltd. |