CN101281731A - Liquid crystal display method - Google Patents
Liquid crystal display method Download PDFInfo
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- CN101281731A CN101281731A CNA2008100156419A CN200810015641A CN101281731A CN 101281731 A CN101281731 A CN 101281731A CN A2008100156419 A CNA2008100156419 A CN A2008100156419A CN 200810015641 A CN200810015641 A CN 200810015641A CN 101281731 A CN101281731 A CN 101281731A
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Abstract
The present invention provides a LCD display method, which adjusts the brightness of a backlight source with a backlight correction brightness adjustment function, and thereby eliminates the trouble of backlight flickering. Specifically, the LCD display method provided in the present invention comprises: receiving the current image signal; calculating the typical brightness data of the current image signal; calculating the backlight correction brightness according to the typical brightness data of the current image signal and the typical brightness data of at least the previous image frame; adjusting the brightness of the backlight source according to the backlight correction brightness; and adjusting the current image signal. In the LCD display method provided in the present invention, since the backlight brightness correction value is determined by not only the brightness of the current image but also the brightness of the previous frame or several previous frames, the change of backlight brightness is gradual, without abrupt variation; therefore, the method can avoid abrupt image brightness variations and frequent image flickering that can perceived by human eyes, and can improve the display quality.
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.
Yet there is certain defective in this regulation technology backlight, because this reality technology is regulated brightness backlight in real time according to the brightness of every two field picture, when the image change that shows is very fast, the brightness of backlight also changes thereupon fast, if the difference in brightness of front and back two two field pictures is bigger, the brightness amplitude of variation of backlight is just bigger, promptly is reflected in picture and shows that upward bright dark variation is violent, the human eye perceptual image glimpses, thereby influences image quality.
Summary of the invention
In order to address the above problem, the invention provides a kind of liquid crystal display method, by correction brightness backlight back light source brightness is adjusted, solved the problem of flicker backlight.
Concrete, liquid crystal display method of the present invention comprises:
Receive the present image signal;
Calculate the typical brightness data of present image signal;
According to the typical brightness data of present image signal and the typical brightness data computation correction brightness backlight of former frame image at least;
According to correction brightness backlight back light source brightness is adjusted;
The present image signal is adjusted.
The typical brightness data that described correction brightness backlight is the present image signal and the mean value of the typical brightness data of former frame image at least.
If the typical brightness data of described present image signal are Y
N, the typical brightness data of former frame image are Y
N-1, described correction brightness backlight is Y, then: Y=Y
N+ a (Y
N-Y
N-1), wherein a is a correction factor backlight.Described correction factor backlight can be regulated according to user's setting.
The luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
Further, the present invention also provides another kind of liquid crystal display method, comprising:
Backlight is divided at least two backlight subregions;
Receive the present image signal;
According to the backlight subregion present image is divided at least two picture portions;
Calculate the typical brightness data of each picture portion;
According to the typical brightness data of current each picture portion and the correction brightness backlight of each subregion of typical brightness data computation of each picture portion of former frame at least;
Correction brightness backlight according to each subregion is adjusted each back light source brightness;
The present image signal is adjusted.
The typical brightness data that at least one correction brightness backlight is current this picture portion and the mean value of the typical brightness data of this picture portion of former frame at least.
If the typical brightness data of current this picture portion are Y
N, the typical brightness data of the former frame image of this picture portion are Y
N-1, the correction brightness backlight of this picture portion is Y, then: Y=Y
N+ a (Y
N-Y
N-1), wherein a is a correction factor backlight.Described correction factor backlight can be regulated according to user's setting.
The luminance weighted mean value that the typical brightness data of at least one picture portion calculate for the brightness histogram statistics by this picture portion.
Liquid crystal display method of the present invention is owing to the brightness calculation of backlight illumination modified value according to current images signal and former frame or former two field pictures obtains, therefore the mitigation that brightness backlight changes, can not brighten suddenly or deepening, this has just solved in the prior art when the image change that shows is very fast, and the brightness of backlight changes too fast problem.
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 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 central processing unit 125.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.
The rgb signal that image processing apparatus 120 receives has one the tunnel can be sent to image analyzing unit 121, is analyzed by 121 pairs of these rgb signals of image analyzing unit, finally 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.After calculating the typical brightness data of image, image analyzing unit 121 is given central processing unit 125 with corresponding data transmission.For convenience, the typical brightness data of present image are designated as Y here
N, and the typical brightness data of former frame image are designated as Y
N-1, the typical brightness data of former frame image are designated as Y again
N-2, the rest may be inferred.
After receiving the next typical brightness data of image analyzing unit 121 transmission, central processing unit 125 calculates current backlight illumination modified value according to typical brightness data and former frame or former frame typical brightness data of present image.The backlight illumination modified value can have a variety of computing method, for example, and by calculating typical brightness mean value of former two field pictures or the like.
Preferably, the current backlight illumination modified value of present embodiment can be calculated by following formula and obtain:
Y＝Y
N+a(Y
N-Y
N-1)
Wherein, a is current correction factor, and its value is a constant between 0 and 1.Correction factor can change according to user's setting, and this just makes user's display effect of regulator solution crystal device very easily.
After calculating current backlight illumination modified value, central processing unit 125 sends to backlight driver 124 and liquid crystal interface unit 123 with this backlight illumination modified value.
The backlight illumination modified value that backlight driver 124 is determined according to central processing unit 125 generates with the corresponding drive signal of this backlight illumination modified value and gives described 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/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.The backlight illumination modified value that liquid crystal interface unit 123 is determined according to central processing unit 125 is adjusted picture signal itself.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 is not more than Y all the time
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/Y
MAXRatio improve accordingly, also can be according to additive method, for example regulate by the method for the mapping of tabling look-up.
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.
Figure 2 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 central processing unit 225.
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 that will calculate each area image send to central processing unit 225.Central processing unit 225 goes out each regional backlight illumination modified value according to the typical brightness data computation of the same area of the typical brightness data of each area image and former two field pictures equally.
After calculating current each regional backlight illumination modified value, central processing unit 225 sends to backlight driver 224 and liquid crystal interface unit 223 with this backlight illumination modified value.
Each regional backlight illumination modified value that backlight driver 224 is determined according to central processing unit 225 generates the respective regions of giving described backlight 140 with the corresponding drive signal of this backlight illumination modified value, thereby realizes each regional backlight illumination is regulated.
Liquid crystal interface unit 223 is adjusted picture signal itself according to each regional backlight illumination modified value that central processing unit 225 is determined equally, no longer describes in detail here.
The image processing apparatus of the liquid crystal indicator among above-mentioned two embodiment can also comprise a storer.Storer is used for the data processed result of each unit of memory image treating apparatus, and like this, each unit of image processing apparatus can be handled accordingly by calling the data of preserving in the storer.
In sum, liquid crystal display method of the present invention is because the single brightness by present image of backlight illumination modified value is definite, also be subjected to simultaneously the influence of the brightness of former frame or former two field pictures, therefore the mitigation that brightness backlight changes, can not brighten suddenly or deepening, this has just solved in the prior art when the image change that shows is very fast, the brightness of backlight changes too fast problem, avoided picture to show that upward bright dark variation is violent, the appearance that the human eye perceptual image glimpses has improved the effect that shows.
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 the present image signal;
Calculate the typical brightness data of present image signal;
According to the typical brightness data of present image signal and the typical brightness data computation correction brightness backlight of former frame image at least;
According to correction brightness backlight back light source brightness is adjusted;
The present image signal is adjusted.
2, liquid crystal display method according to claim 1 is characterized in that: the typical brightness data that described correction brightness backlight is the present image signal and the mean value of the typical brightness data of former frame image at least.
3, liquid crystal display method according to claim 1 is characterized in that: if the typical brightness data of described present image signal are Y
N, the typical brightness data of former frame image are Y
N-1, described correction brightness backlight is Y, then:
Y=Y
N+ a (Y
N-Y
N-1), wherein a is a correction factor backlight.
4, liquid crystal display method according to claim 3 is characterized in that: described correction factor backlight can be regulated according to user's setting.
5, according to the arbitrary described liquid crystal display method of claim 1-4, it is characterized in that: the luminance weighted mean value that described typical brightness data calculate for the brightness histogram statistics by image.
6, a kind of liquid crystal display method comprises:
Backlight is divided at least two backlight subregions;
Receive the present image signal;
According to the backlight subregion present image is divided at least two picture portions;
Calculate the typical brightness data of each picture portion;
According to the typical brightness data of current each picture portion and the correction brightness backlight of each subregion of typical brightness data computation of each picture portion of former frame at least;
Correction brightness backlight according to each subregion is adjusted each back light source brightness;
The present image signal is adjusted.
7, liquid crystal display method according to claim 6 is characterized in that: the typical brightness data that at least one correction brightness backlight is current this picture portion and the mean value of the typical brightness data of this picture portion of former frame at least.
8, liquid crystal display method according to claim 6 is characterized in that: if the typical brightness data of current this picture portion are Y
N, the typical brightness data of the former frame image of this picture portion are Y
N-1, the correction brightness backlight of this picture portion is Y, then:
Y=Y
N+ a (Y
N-Y
N-1), wherein a is a correction factor backlight.
9, liquid crystal display method according to claim 8 is characterized in that: described correction factor backlight can be regulated according to user's setting.
10, according to the arbitrary described liquid crystal display method of claim 6-9, it is characterized in that: the luminance weighted mean value that the typical brightness data of at least one picture portion calculate for the brightness histogram statistics by this picture portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100156419A CN101281731A (en) | 2008-03-26 | 2008-03-26 | Liquid crystal display method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100156419A CN101281731A (en) | 2008-03-26 | 2008-03-26 | Liquid crystal display method |
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| CN101281731A true CN101281731A (en) | 2008-10-08 |
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ID=40014162
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101894532A (en) * | 2009-05-19 | 2010-11-24 | 日立民用电子株式会社 | Image display device |
| 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 |
| CN103050095A (en) * | 2013-01-06 | 2013-04-17 | 青岛海信电器股份有限公司 | Backlight driving method and backlight module as well as television |
| CN104038839A (en) * | 2014-04-29 | 2014-09-10 | 四川长虹电器股份有限公司 | TV (television) image quality adjustment method |
| CN104584114A (en) * | 2012-08-20 | 2015-04-29 | 富士胶片株式会社 | Liquid crystal display device |
| CN105009195A (en) * | 2013-02-20 | 2015-10-28 | 富士胶片株式会社 | Liquid crystal display device |
| CN107909970A (en) * | 2017-12-29 | 2018-04-13 | 晨星半导体股份有限公司 | Display device and its corresponding local dimming driving method |
| WO2018103357A1 (en) * | 2016-12-08 | 2018-06-14 | 青岛海信电器股份有限公司 | Method and device for generating backlight control signal in liquid crystal display device |
| CN109545132A (en) * | 2018-11-26 | 2019-03-29 | 昆山国显光电有限公司 | Shield body display methods, display screen and electronic equipment |
| CN109754763A (en) * | 2019-03-27 | 2019-05-14 | 合肥京东方光电科技有限公司 | Backlight driver module and its working method and display device |
| CN110364123A (en) * | 2019-08-20 | 2019-10-22 | 京东方科技集团股份有限公司 | Method, apparatus, electronic equipment and the computer readable storage medium of backlight control |
| 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 |
| 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 |
| CN110992903A (en) * | 2019-12-25 | 2020-04-10 | 深圳创维－Rgb电子有限公司 | Display screen backlight brightness adjusting method and device, computer equipment and medium |
| CN111599320A (en) * | 2020-06-22 | 2020-08-28 | 京东方科技集团股份有限公司 | Backlight adjusting method and device of display device and display device |
| CN113781968A (en) * | 2021-09-08 | 2021-12-10 | 深圳创维－Rgb电子有限公司 | Backlight adjusting method, device, equipment and storage medium |
-
2008
- 2008-03-26 CN CNA2008100156419A patent/CN101281731A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101894532B (en) * | 2009-05-19 | 2013-04-03 | 日立民用电子株式会社 | Image display apparatus |
| CN101894532A (en) * | 2009-05-19 | 2010-11-24 | 日立民用电子株式会社 | Image display device |
| 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 |
| CN104584114A (en) * | 2012-08-20 | 2015-04-29 | 富士胶片株式会社 | Liquid crystal display device |
| CN103050095A (en) * | 2013-01-06 | 2013-04-17 | 青岛海信电器股份有限公司 | Backlight driving method and backlight module as well as television |
| CN105009195A (en) * | 2013-02-20 | 2015-10-28 | 富士胶片株式会社 | Liquid crystal display device |
| CN104038839B (en) * | 2014-04-29 | 2017-09-29 | 四川长虹电器股份有限公司 | Picture quality of television method of adjustment |
| CN104038839A (en) * | 2014-04-29 | 2014-09-10 | 四川长虹电器股份有限公司 | TV (television) image quality adjustment method |
| WO2018103357A1 (en) * | 2016-12-08 | 2018-06-14 | 青岛海信电器股份有限公司 | Method and device for generating backlight control signal in liquid crystal display device |
| US10777147B2 (en) | 2017-12-29 | 2020-09-15 | Mediatek Inc. | Display device and corresponding regional dimming driving method |
| CN107909970A (en) * | 2017-12-29 | 2018-04-13 | 晨星半导体股份有限公司 | Display device and its corresponding local dimming driving method |
| CN109545132A (en) * | 2018-11-26 | 2019-03-29 | 昆山国显光电有限公司 | Shield body display methods, display screen and electronic equipment |
| CN109754763A (en) * | 2019-03-27 | 2019-05-14 | 合肥京东方光电科技有限公司 | Backlight driver module and its working method and display device |
| CN110364123A (en) * | 2019-08-20 | 2019-10-22 | 京东方科技集团股份有限公司 | Method, apparatus, electronic equipment and the computer readable storage medium of backlight control |
| US11393416B2 (en) | 2019-08-20 | 2022-07-19 | Beijing Boe Optoelectronics Technology Co., Ltd. | Method and device for backlight control, electronic device, and computer readable storage medium |
| 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 |
| 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 |
| CN110992903A (en) * | 2019-12-25 | 2020-04-10 | 深圳创维－Rgb电子有限公司 | Display screen backlight brightness adjusting method and device, computer equipment and medium |
| CN110992903B (en) * | 2019-12-25 | 2022-09-09 | 深圳创维－Rgb电子有限公司 | Display screen backlight brightness adjusting method and device, computer equipment and medium |
| CN111599320A (en) * | 2020-06-22 | 2020-08-28 | 京东方科技集团股份有限公司 | Backlight adjusting method and device of display device and display device |
| CN111599320B (en) * | 2020-06-22 | 2021-03-16 | 京东方科技集团股份有限公司 | Backlight adjusting method and device of display device and display device |
| US20230094077A1 (en) * | 2020-06-22 | 2023-03-30 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight adjusting method of display device, backlight adjusting device and display device |
| US11915661B2 (en) * | 2020-06-22 | 2024-02-27 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight adjusting method of display device, backlight adjusting device and display device |
| CN113781968A (en) * | 2021-09-08 | 2021-12-10 | 深圳创维－Rgb电子有限公司 | Backlight adjusting method, device, equipment and storage medium |
| WO2023035939A1 (en) * | 2021-09-08 | 2023-03-16 | 深圳创维－Rgb电子有限公司 | Backlight adjustment method and apparatus, device, and storage medium |
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