CN101281732A - Liquid crystal display method - Google Patents
Liquid crystal display method Download PDFInfo
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- CN101281732A CN101281732A CNA2008100156442A CN200810015644A CN101281732A CN 101281732 A CN101281732 A CN 101281732A CN A2008100156442 A CNA2008100156442 A CN A2008100156442A CN 200810015644 A CN200810015644 A CN 200810015644A CN 101281732 A CN101281732 A CN 101281732A
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Abstract
The present invention provides a LCD display method, which adjusts the current brightness of the backlight source according to the image data of the previous frame or several previous frames. Specifically, the LCD display method provided in the present invention comprises: receiving a first image signal; calculating the typical brightness data of the first image signal; receiving a second image signal; adjusting the brightness of the backlight source according to the typical brightness data of the first image signal; adjusting the second image signal according to the typical brightness data of the first image signal; displaying the second image signal. The LCD display method provided in the present invention adjusts the current brightness of the backlight source and the image itself according to the typical brightness data of the previous image frame, and thereby can avoid image delay and reduce the cost of LCD display.
Description
Technical field
The present invention relates to a kind of display packing, relate to a kind of method for displaying image that is used for liquid crystal display more specifically.
Background technology
Lcd technology has obtained development fast in recent years, but contrasts the display technique of other kinds, and liquid crystal display is still having gap aspect contrast and the color saturation.
The liquid crystal display (LCD) of liquid crystal indicator (as LCD TV) itself is not luminous, but belong to the backlight display device, there is backlight behind at liquid crystal display, and liquid crystal indicator is to show or go back original picture by the light that evenly distributed tiny liquid crystal particle on the screen sends by " blocking-up " and " opening " backlight.In the starting stage, as long as the LCD energized, backlight is just in work, even picture displayed is the black full picture of a width of cloth, backlight is also in work.That is to say that the backlight of LCD TV is forever luminous.Because the transmittance of liquid crystal is extremely low, make the brightness of LCD TV reach the degree that is enough to perfect display frame, the brightness of backlight will be very high, so not only can shorten the serviceable life of the backlight of liquid crystal indicator, and make beholder's eyes become tired easily; And if reduce the brightness of backlight, then can reduce the contrast and the color saturation of shown image.
The appearance of regulation technology backlight and development address this problem to a certain extent, utilize regulation technology backlight dynamically to adjust backlight according to image content, concrete method is that backlight dynamic point brightening circuit system (generally adopting programmable logic device (PLD) and a plurality of hardware device) is set, according to image content backlight illumination is controlled, regulated to backlight, guarantee the contrast and the color saturation of image on the one hand, prolong the serviceable life of backlight on the other hand.
As a kind of improvement of regulation technology backlight, a kind of backlight is divided into a plurality of zones, the technology of the backlight zones of different being carried out adjustment backlight respectively also begins to occur.This technology is adjusted the brightness of backlight according to the image of the subregion correspondence of backlight, and this technology has improved the quality of liquid crystal display to a great extent, and subregion is many more in the ordinary course of things, and its display effect is just good more.Yet because the image of current input is depended in brightness adjustment backlight, for example brightness of image or the like, present most of backlight adjusting methods all are according to the current images signal real-time adjustment to be carried out in the brightness of backlight, and this need could obtain to adjust accordingly data through a large amount of mathematical operations after receiving present image.This can cause certain time-delay, has influenced the speed of liquid crystal display to a certain extent, and such real-time operation to process chip require morely, cost is also than higher.This area needs a kind of method to solve this problem.
Summary of the invention
The invention provides a kind of liquid crystal display method, current back light source brightness is adjusted, solved the problems referred to above by the view data of former frame or former frames.
Concrete, liquid crystal display method of the present invention comprises:
Receive first picture signal;
Calculate the typical brightness data of first picture signal;
Receive second picture signal;
Typical brightness data according to first picture signal are adjusted back light source brightness;
Typical brightness data according to first picture signal are adjusted second picture signal;
Show second picture signal.
Described first image and second image are two continuous two field pictures.
The luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
Described liquid crystal display method also comprises step: first picture signal is converted to YUV signal.
Described liquid crystal display method also comprises step: second picture signal is carried out the colourity optimization process.
Further, the present invention also provides another kind of liquid crystal display method, comprising:
Backlight is divided at least two backlight subregions;
Receive first picture signal;
According to the backlight subregion first image division is at least two picture portions;
Calculate the typical brightness data of first each picture portion of image;
Receive second picture signal;
Typical brightness data according to first each picture portion of image are adjusted the brightness of each backlight subregion;
Typical brightness data according to first each picture portion of image are adjusted the respective regions of second image;
Show second picture signal.
Described first image and second image are two continuous two field pictures.
The luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
Described liquid crystal display method also comprises step: first picture signal is converted to YUV signal.
Described liquid crystal display method also comprises step: second picture signal is carried out the colourity optimization process.
Liquid crystal display method of the present invention is adjusted the brightness in current backlight source by the typical brightness data of former frame image, according to the typical brightness data of former frame image the current images signal is adjusted simultaneously, and do not need to wait for that image analyzing unit calculates each regional typical brightness data of present image signal, avoided the time-delay of image.Simultaneously, the processing mode that such processing mode is more real-time is more saved system resource, and is also lower to the requirement of processing apparatus, reduced the cost of liquid crystal indicator.
Description of drawings
Figure 1 shows that the synoptic diagram of first embodiment of the liquid crystal indicator of using liquid crystal display method of the present invention.
Figure 2 shows that a workflow synoptic diagram of the liquid crystal indicator of first embodiment.
Figure 3 shows that the synoptic diagram of second embodiment of the liquid crystal indicator of using liquid crystal display method of the present invention
Embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Figure 1 shows that the synoptic diagram of first embodiment of the liquid crystal indicator of using liquid crystal display method of the present invention.As shown in the figure, liquid crystal indicator comprises image input interface 110, image processing apparatus 120, LCDs 130 and backlight 140.Described image processing apparatus 120 comprises image analyzing unit 121, liquid crystal interface unit 123, backlight driver 124 and storer 126.Described image processing apparatus 120 can be made up of a plurality of discrete devices, also can be integral structure, is integrated on the chip piece.
After receiving a frame image signal, image processing apparatus 120 is delivered to the rgb signal that receives and delivers to image analyzing unit 121.Image analyzing unit 121 begins this rgb signal is analyzed after receiving a frame rgb signal, calculates the typical brightness data of present image.The typical brightness data computing method of image can be undertaken by various analysis, can directly analyze the spatial domain of picture signal, also can analyze the frequency field of picture signal.The for example directly brightness of computed image signal by such as means such as Fourier transform, Laplace transforms picture signal being analyzed, or is analyzed or the like the frequency spectrum of picture signal by additive method.
With the statistics with histogram analysis is example, the frame rgb signal that image analyzing unit 121 at first will receive is converted to the data-signal of yuv format, the purpose of image transitions is in order to extract the luminance signal of rgb signal the inside, so this process also can be replaced by the monochrome information of extracting rgb signal.After the brightness data that has obtained entire image, image analyzing unit 121 carries out statistics with histogram to these brightness datas, brightness histogram statistics by present image, calculate the luminance weighted mean value of present image, this luminance weighted mean value promptly can be as the typical brightness data of present image.At last, image analyzing unit 121 with the typical brightness data storage that calculates in storer 126 the insides.For convenience, the typical brightness data of present image are designated as Y here
N, before this, image analyzing unit 121 is designated as Y with the typical brightness data that same method has calculated the former frame image
N-1, and the typical brightness data of each two field picture of front again, be designated as Y respectively
N-2, Y
N-3Or the like, and the like.These typical brightness data equally have been stored in storer 126 the insides.Certainly, according to actual needs, 126 of storeies need the data of several frames in preservation front just passable.After having analyzed present image, image analyzing unit 121 then begins the image of next frame is analyzed.
At this moment, backlight driver 124 is according to the typical brightness data Y of the former frame image of storing in the storer
N-1Brightness to backlight is adjusted.Generate and Y
N-1Corresponding drive signal is given backlight 140.This drive signal is PWM (the pulse width modulation) signal (also being pulse width modulated signals) of certain dutycycle, described PWM drive signal is drive current just, because brightness is by the decision of the luminous flux of RGB-LED (RGB light emitting diode), and LED luminous flux and electric current are linear, are to be determined by drive current so also we can say brightness.
The dutycycle of said PWM signal can be calculated by following formula and obtain:
r＝Y
N-1/Y
MAX
Wherein, r is the dutycycle of pwm signal, Y
MAXBe the high-high brightness of backlight, Y
MAXValue be generally 255.
Owing to the brightness of backlight is adjusted,, must also be adjusted accordingly to picture signal itself for the original image of correct demonstration.Liquid crystal interface unit 123 is at first adjusted the brightness of image.From the top process that back light source brightness is adjusted as can be seen, because Y
N-1All the time be not more than Y
MAX, so back light source brightness has all been turned down generally speaking.Therefore, the brightness of image just need be heightened accordingly, and the ratio of its adjustment can be according to Y
N-1/ Y
MAXRatio improve accordingly, also can be according to additive method, for example regulate by the method for the mapping of tabling look-up.
Preferably, the liquid crystal indicator of present embodiment uses the mode of geometric ratio amplification that the brightness of image is adjusted.For current YUV signal, revised brightness
Y’＝Y/r
Wherein, Y is the brightness of current YUV signal.
Except the brightness of picture signal was adjusted, liquid crystal interface unit 123 can also carry out the colourity optimization process to the picture signal of each picture portion with reference to a configurable two-dimentional reference table.Generally speaking, the parameter values in the described configurable two-dimentional reference table is the experience ginseng value that obtains by a large amount of subjective evaluation and tests.
At last, liquid crystal interface unit 123 is converted to signal that LCDs 130 can show with adjusted YUV signal and exports LCDs 130 to and show.
Figure 2 shows that a process flow diagram of said process, the course of work of present embodiment can clearly be described.
From above process as can be seen, the liquid crystal indicator of present embodiment is adjusted current back light source brightness by the typical brightness data of former frame image, according to the typical brightness data of former frame image the current images signal is adjusted simultaneously, and do not need to wait for that image analyzing unit calculates the typical brightness data of present image signal, avoided the time-delay of image.Simultaneously, the processing mode that such processing mode is more real-time is more saved system resource, and is also lower to the requirement of processing apparatus, reduced the cost of liquid crystal indicator.
Figure 3 shows that the synoptic diagram of second embodiment of the liquid crystal indicator of using liquid crystal display method of the present invention, different with liquid crystal indicator shown in Figure 1, the image processing apparatus 220 of this liquid crystal indicator also comprises a zoning unit 222 except comprising image analyzing unit 221, liquid crystal interface unit 223, backlight driver 224 and storer 226.
Picture signal after the subregion is transported to image analyzing unit 221,221 pairs of these picture signals of image analyzing unit are analyzed, calculate the typical brightness data of each area image, and the typical brightness data storage that will calculate each area image is in storer 226 the insides.Before this, image analyzing unit 221 has calculated each regional typical brightness data of each two field picture of front with same method.These typical brightness data equally have been stored in storer 226 the insides, and certainly, according to actual needs, 226 of storeies need the data of several frames in preservation front just passable.After having analyzed present image, image analyzing unit 221 then begins the image of next frame is analyzed.
Meanwhile, backlight driver 224 is adjusted the back light source brightness of each backlight subregion according to each regional typical brightness data of the previous frame image of preserving in the storer 226.Generate the respective regions of giving backlight 140 with each regional corresponding drive signal of typical brightness data of previous frame image, thereby realize each regional backlight illumination is regulated.
Liquid crystal interface unit 223 is adjusted the current images signal according to each regional typical brightness data of the previous frame image of preserving in the storer 226 equally, at last adjusted YUV signal is converted to signal that LCDs 130 can show and exports LCDs 130 to and show.Here no longer describe in detail.
Equally, the liquid crystal indicator of present embodiment by each regional typical brightness data of former frame image to current backlight each regional brightness adjust, according to each regional typical brightness data of former frame image the current images signal is adjusted simultaneously, and do not need to wait for that image analyzing unit calculates each regional typical brightness data of present image signal, avoided the time-delay of image.Simultaneously, the processing mode that such processing mode is more real-time is more saved system resource, and is also lower to the requirement of processing apparatus, reduced the cost of liquid crystal indicator.
In sum, liquid crystal display method of the present invention is adjusted the brightness in current backlight source by the typical brightness data of former frame image, according to the typical brightness data of former frame image the current images signal is adjusted simultaneously, and do not need to wait for that image analyzing unit calculates each regional typical brightness data of present image signal, avoided the time-delay of image.Simultaneously, the processing mode that such processing mode is more real-time is more saved system resource, and is also lower to the requirement of processing apparatus, reduced the cost of liquid crystal indicator.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (10)
1, a kind of liquid crystal display method comprises:
Receive first picture signal;
Calculate the typical brightness data of first picture signal;
Receive second picture signal;
Typical brightness data according to first picture signal are adjusted back light source brightness;
Typical brightness data according to first picture signal are adjusted second picture signal;
Show second picture signal.
2, liquid crystal display method according to claim 1 is characterized in that: described first image and second image are two continuous two field pictures.
3, liquid crystal display method according to claim 1 and 2 is characterized in that: the luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
4, liquid crystal display method according to claim 3 is characterized in that: described liquid crystal display method also comprises step: first picture signal is converted to YUV signal.
5, liquid crystal display method according to claim 4 is characterized in that: described liquid crystal display method also comprises step: second picture signal is carried out the colourity optimization process.
6, a kind of liquid crystal display method comprises:
Backlight is divided at least two backlight subregions;
Receive first picture signal;
According to the backlight subregion first image division is at least two picture portions;
Calculate the typical brightness data of first each picture portion of image;
Receive second picture signal;
Typical brightness data according to first each picture portion of image are adjusted the brightness of each backlight subregion;
Typical brightness data according to first each picture portion of image are adjusted the respective regions of second image;
Show second picture signal.
7, liquid crystal display method according to claim 6 is characterized in that: described first image and second image are two continuous two field pictures.
8, according to claim 6 or 7 described liquid crystal display methods, it is characterized in that: the luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
9, liquid crystal display method according to claim 8 is characterized in that: described liquid crystal display method also comprises step: first picture signal is converted to YUV signal.
10, liquid crystal display method according to claim 9 is characterized in that: described liquid crystal display method also comprises step: second picture signal is carried out the colourity optimization process.
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| CNA2008100156442A CN101281732A (en) | 2008-03-26 | 2008-03-26 | Liquid crystal display method |
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Cited By (11)
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|---|---|---|---|---|
| CN102298904A (en) * | 2010-06-28 | 2011-12-28 | 华为终端有限公司 | Method for adjusting backlight brightness of display device and equipment with display device |
| CN101727848B (en) * | 2008-10-10 | 2012-02-15 | 华映视讯（吴江）有限公司 | Data alignment device and data alignment method of liquid crystal display |
| CN103198801A (en) * | 2013-03-11 | 2013-07-10 | 深圳市华星光电技术有限公司 | Compensation method for flat display panel large-viewing-angle Mura area |
| CN105632423A (en) * | 2016-03-31 | 2016-06-01 | 京东方科技集团股份有限公司 | Backlight module and driving method thereof, and display device |
| CN107731184A (en) * | 2017-10-25 | 2018-02-23 | 惠科股份有限公司 | The driving method and display device of a kind of display device |
| WO2019033780A1 (en) * | 2017-08-14 | 2019-02-21 | 京东方科技集团股份有限公司 | Backlight source driving method and drive circuit, backlight source and display device |
| CN110660364A (en) * | 2019-09-18 | 2020-01-07 | 惠州视维新技术有限公司 | Method and device for adjusting regional backlight and storage medium |
| CN110767184A (en) * | 2019-11-28 | 2020-02-07 | 京东方科技集团股份有限公司 | Backlight brightness processing method, system, display device and medium |
| CN110827770A (en) * | 2019-12-24 | 2020-02-21 | 惠州视维新技术有限公司 | Regional backlight brightness adjusting method and device for display image and storage medium |
| CN111508443A (en) * | 2020-05-29 | 2020-08-07 | 京东方科技集团股份有限公司 | Display device and backlight brightness control method and device thereof |
| CN112419987A (en) * | 2020-11-27 | 2021-02-26 | 京东方科技集团股份有限公司 | Backlight driving method and device and display system |
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2008
- 2008-03-26 CN CNA2008100156442A patent/CN101281732A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101727848B (en) * | 2008-10-10 | 2012-02-15 | 华映视讯（吴江）有限公司 | Data alignment device and data alignment method of liquid crystal display |
| CN102298904A (en) * | 2010-06-28 | 2011-12-28 | 华为终端有限公司 | Method for adjusting backlight brightness of display device and equipment with display device |
| CN103198801A (en) * | 2013-03-11 | 2013-07-10 | 深圳市华星光电技术有限公司 | Compensation method for flat display panel large-viewing-angle Mura area |
| CN103198801B (en) * | 2013-03-11 | 2015-02-04 | 深圳市华星光电技术有限公司 | Compensation method for flat display panel large-viewing-angle Mura area |
| CN105632423A (en) * | 2016-03-31 | 2016-06-01 | 京东方科技集团股份有限公司 | Backlight module and driving method thereof, and display device |
| CN105632423B (en) * | 2016-03-31 | 2018-01-16 | 京东方科技集团股份有限公司 | A kind of backlight module and its driving method, display device |
| CN109389951B (en) * | 2017-08-14 | 2021-01-26 | 京东方科技集团股份有限公司 | Backlight driving method and driving circuit, backlight and display device |
| WO2019033780A1 (en) * | 2017-08-14 | 2019-02-21 | 京东方科技集团股份有限公司 | Backlight source driving method and drive circuit, backlight source and display device |
| CN109389951A (en) * | 2017-08-14 | 2019-02-26 | 京东方科技集团股份有限公司 | Driving method and driving circuit, the backlight and display device of backlight |
| US11455963B2 (en) | 2017-08-14 | 2022-09-27 | Beijing Boe Display Technology Co., Ltd. | Driving method and driving circuit for backlight, backlight and display apparatus |
| CN107731184A (en) * | 2017-10-25 | 2018-02-23 | 惠科股份有限公司 | The driving method and display device of a kind of display device |
| WO2019080285A1 (en) * | 2017-10-25 | 2019-05-02 | 惠科股份有限公司 | Driving method for display apparatus, and display apparatus |
| US11238814B2 (en) | 2017-10-25 | 2022-02-01 | HKC Corporation Limited | Driving method for display apparatus for adjusting grayscale value of display image and display device thereof |
| CN110660364A (en) * | 2019-09-18 | 2020-01-07 | 惠州视维新技术有限公司 | Method and device for adjusting regional backlight and storage medium |
| CN110767184B (en) * | 2019-11-28 | 2021-02-12 | 京东方科技集团股份有限公司 | Backlight brightness processing method, system, display device and medium |
| CN110767184A (en) * | 2019-11-28 | 2020-02-07 | 京东方科技集团股份有限公司 | Backlight brightness processing method, system, display device and medium |
| CN110827770A (en) * | 2019-12-24 | 2020-02-21 | 惠州视维新技术有限公司 | Regional backlight brightness adjusting method and device for display image and storage medium |
| CN110827770B (en) * | 2019-12-24 | 2022-03-01 | 惠州视维新技术有限公司 | Regional backlight brightness adjusting method and device for display image and storage medium |
| CN111508443A (en) * | 2020-05-29 | 2020-08-07 | 京东方科技集团股份有限公司 | Display device and backlight brightness control method and device thereof |
| CN111508443B (en) * | 2020-05-29 | 2021-08-24 | 京东方科技集团股份有限公司 | Display device and backlight brightness control method and device thereof |
| US11495183B2 (en) | 2020-05-29 | 2022-11-08 | Beijing Bde Technology Development Co., Ltd. | Method and device for controlling backlight brightness, and display device |
| CN112419987A (en) * | 2020-11-27 | 2021-02-26 | 京东方科技集团股份有限公司 | Backlight driving method and device and display system |
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