CN101281733B - Liquid crystal display method - Google Patents
Liquid crystal display method Download PDFInfo
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- CN101281733B CN101281733B CN2008100156457A CN200810015645A CN101281733B CN 101281733 B CN101281733 B CN 101281733B CN 2008100156457 A CN2008100156457 A CN 2008100156457A CN 200810015645 A CN200810015645 A CN 200810015645A CN 101281733 B CN101281733 B CN 101281733B
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Abstract
The present invention provides a LCD display method, which comprises: receiving an image signal; performing statistics on the times of occurrence of brightness values of all pixels in the image signalat each brightness level; comparing the number of pixels at each brightness level one by one with the a preset value, starting from the first brightness level; setting the brightness value of the brightness level as the typical brightness data of the image signal, if the number of pixels at the brightness level is greater than the preset value; adjusting the brightness of the backlight source according to the typical brightness data of the image signal; adjusting the image signal. The LCD display method provided in the present invention calculates the typical brightness data of the current image signal by performing statistics on the brightness data of the image signal, and adjusts the brightness of the backlight source and the image accordingly, and thereby improves the LCD 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 current regulation technology most of backlight all is the brightness of backlight to be adjusted as the typical brightness data of image with the high-high brightness of picture signal, limited the amplitude of adjusting backlight to a certain extent, also limit simultaneously the raising of the contrast of image, can not reach the optimum efficiency of demonstration backlight.
Summary of the invention
In order to address the above problem, the invention provides a kind of liquid crystal display method, calculate the typical brightness data of present image signal by the brightness data of statistical picture signal, and in view of the above the brightness and the image of backlight are adjusted, improved the effect of liquid crystal display.
Concrete, liquid crystal display method of the present invention comprises:
Receive picture signal;
The number of times that the brightness value of all pixels of statistical picture signal occurs at each brightness degree;
Described brightness degree from 0 to 255 is divided into 256 brightness degrees; Since first brightness degree, one by one the number of pixels of each brightness degree is compared with predefined data; When the number of pixels of this brightness degree during greater than these predefined data, the brightness value of setting this brightness degree is the typical brightness data of picture signal;
Typical brightness data according to picture signal are adjusted back light source brightness;
Picture signal is adjusted.
Described first brightness degree can be the high-high brightness of present image.
Described first brightness degree can be 255.
Described predefined data can change according to user's setting.
Described predefined data can be determined according to the pixel count of picture signal.
Further, the present invention also provides another 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;
Add up the number of times that the brightness value of all pixels of at least one picture portion occurs at each brightness degree;
Described brightness degree from 0 to 255 is divided into 256 brightness degrees; Since first brightness degree, one by one the number of pixels of this each brightness degree of picture portion is compared with predefined data; When the number of pixels of this brightness degree during, set the typical brightness data of the brightness value of this brightness degree for this picture portion greater than these predefined data;
Typical brightness data according to this picture portion are adjusted the brightness of corresponding backlight source;
Picture signal to this picture portion is adjusted.
Described first brightness degree can be the high-high brightness of present image.
Described first brightness degree can be 255.
Described predefined data can change according to user's setting.
Described predefined data can be determined according to the pixel count of this picture portion.
Liquid crystal display method of the present invention is added up by the brightness data to picture signal, calculate the typical brightness data of picture signal, the typical brightness data that calculate by this method generally are lower than the high-high brightness of picture signal, this just makes that the brightness of backlight is adjustable lower, thereby reduced the power consumption of backlight, the contrast of the picture signal on this typical brightness data basis also can improve simultaneously, thereby has improved the effect that shows.
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 schematic diagram of image analyzing unit 121 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.
Figure 4 shows that the synoptic diagram of the 3rd 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.Present most computing method all are to analyze by the brightness of image, and for example the maximum effectively brightness value of computed image calculates luminance weighted mean value or the like by statistics with histogram.
The computing method of present embodiment are different, the image analyzing unit 121 of present embodiment at first extracts the brightness data of picture signal, after the brightness data that has obtained each pixel of picture signal, image analyzing unit 121 is added up these brightness datas, counts the number of times of the brightness value of all pixels in each brightness degree appearance.The statistical method of image analyzing unit 121 also has multiple, illustrates this course of work of explanation image analyzing unit 121 below.
Figure 2 shows that the schematic diagram of image analyzing unit 121 of the liquid crystal indicator of first embodiment.As shown in the figure, image analyzing unit 121 comprises a brightness statistics storer 180, in order to add up convenient, brightness statistics storer 180 has all distributed corresponding storage space to each brightness degree, the number of times that occurs at each brightness degree in order to the pixel of storage present image signal.
Because present brightness of image grade generally from 0 to 255 is divided into 256 brightness degrees, therefore, brightness statistics storer 180 has comprised 256 register R0-R255, is used for writing down respectively the number of pixels of 256 brightness degrees of present image.When image analyzing unit 121 received a new picture signal, brightness statistics storer 180 was at first with the data zero clearing in 256 registers.Then image analyzing unit 121 begins to extract the brightness data of picture signal.The brightness data of image analyzing unit 121 each pixel of extraction one by one, and the brightness data that extracts is transferred to brightness statistics storer 180, brightness statistics storer 180 whenever receives the brightness data of a pixel, and just the data with the corresponding register of this brightness data add one.For example, the brightness data of the pixel of current extraction is 50, and then 180 of brightness statistics storeies add one with the data among the register R50.Like this, after the brightness data of all pixels of having extracted present image, the data in 256 registers in the brightness statistics storer 180 have just been represented the number of times that the brightness value of all pixels of present image signal occurs at each brightness degree.
After statistics was finished the brightness data of present image signal, image analyzing unit 121 was from register R255, sense data from register one by one.Image analyzing unit 121 whenever reads a register, just the data in this register are compared with predefined data, when data in this register during greater than these predefined data, image analyzing unit 121 stops to read register, simultaneously the brightness degree of current register correspondence is defined as the typical brightness data of present image signal.Wherein, the predefined data here are a natural number (for example 2000), and its size can change according to user's setting, also can calculate according to the size of image and obtain (for example 1 percent of image pixel quantity or the like).In order to obtain effect better, generally speaking, the pixel of image is many more, and these data should be big more, and the pixel of image is few more, and these data are more little.
After calculating the typical brightness data of image, image analyzing unit 121 is given central processing unit 125 with corresponding data transmission.After receiving the next typical brightness data of image analyzing unit 121 transmission, central processing unit 125 calculates current backlight illumination modified value Y according to the typical brightness data and the related 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.
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 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 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.
Figure 4 shows that the synoptic diagram of the 3rd embodiment of a liquid crystal indicator of using liquid crystal display method of the present invention.Different with the liquid crystal indicator of second embodiment, the liquid crystal indicator of this embodiment uses programmable logic device (PLD) 321 to replace image analyzing unit 221.Programmable logic device (PLD) 321 is in fact similar with the effect of image analyzing unit 221, and is just different on the implementation method.
Because programmable logic device (PLD) 321 is built-in with BLOCK RAM storer, can add up image brightness more easily.At first, programmable logic device (PLD) 321 is used the brightness statistics storer of built-in BLOCK RAM composing images, makes up the temporary register of the register of 256 3BI T width as 256 brightness then.Simultaneously the initial value of brightness statistics storer and temporary register is composed 0.
Programmable logic device (PLD) 321 utilizes data clock to drive temporary register and BLOCK RAM work.When detecting first field synchronization, statistical work begins.Be expert between sync period, brightness data of programmable logic device (PLD) 321 every receptions, the corresponding temporary register value of these data adds 1, and whether the value that detects this register subsequently is to 4.If the value to 4 of the register that detects then with the register zero clearing, is read the brightness statistics storer of restoring after the corresponding value of brightness statistics storer adds 4 simultaneously.
In an end, programmable logic device (PLD) 321 is at first utilized 255 clocks from 255 to 0 value of readout memory one by one, then this value is added the value of front corresponding registers, value and predefined data of doing behind the addition are made comparisons, if this does value behind the addition greater than these predefined data, then be with this data setting.The typical brightness data of present image.
The internal resource that the liquid crystal indicator of present embodiment makes full use of programmable logic device (PLD) calculates the typical brightness data of picture signal, has saved hardware resource.
In sum, liquid crystal display method of the present invention is added up by the brightness data to picture signal, calculate the typical brightness data of picture signal, the typical brightness data that calculate by this method generally are lower than the high-high brightness of picture signal, this just makes that the brightness of backlight is adjustable lower, thereby reduced the power consumption of backlight, the contrast of the picture signal on this typical brightness data basis also can improve simultaneously, thereby 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 (6)
1. liquid crystal display method comprises:
Receive picture signal;
The number of times that the brightness value of all pixels of statistical picture signal occurs at each brightness degree;
Described brightness degree from 0 to 255 is divided into 256 brightness degrees, since first brightness degree, one by one the number of pixels of each brightness degree is compared with predefined data; Described first brightness degree is 255; When the number of pixels of this brightness degree during greater than these predefined data, the brightness value of setting this brightness degree is the typical brightness data of picture signal;
Typical brightness data according to picture signal are adjusted back light source brightness;
Picture signal is adjusted.
2. liquid crystal display method according to claim 1 is characterized in that: described first brightness degree is the high-high brightness of present image.
3. according to the arbitrary described liquid crystal display method of claim 1-2, it is characterized in that: described predefined data can change according to user's setting.
4. 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;
Add up the number of times that the brightness value of all pixels of at least one picture portion occurs at each brightness degree;
Described brightness degree from 0 to 255 is divided into 256 brightness degrees;
Since first brightness degree, one by one the number of pixels of this each brightness degree of picture portion is compared with predefined data; When the number of pixels of this brightness degree during, set the typical brightness data of the brightness value of this brightness degree for this picture portion greater than these predefined data; Described first brightness degree is 255;
Typical brightness data according to this picture portion are adjusted the brightness of corresponding backlight source;
Picture signal to this picture portion is adjusted.
5. liquid crystal display method according to claim 4 is characterized in that: described first brightness degree is the high-high brightness of present image.
6. according to the arbitrary described liquid crystal display method of claim 4-5, it is characterized in that: described predefined data can change according to user's setting.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102223546B (en) * | 2011-06-07 | 2016-06-08 | 中兴通讯股份有限公司 | The luminance regulating method of video image and device |
| TWI475553B (en) * | 2013-04-29 | 2015-03-01 | Wistron Corp | Backlight control module and backlight control method |
| CN103617792B (en) * | 2013-11-14 | 2015-09-09 | 天津三星电子有限公司 | A kind of regulate display terminal picture to show method and display terminal |
| CN105139814B (en) * | 2015-06-05 | 2017-10-17 | 深圳创维－Rgb电子有限公司 | Liquid crystal display and its display methods |
| WO2018132987A1 (en) * | 2017-01-18 | 2018-07-26 | 华为技术有限公司 | Luminance adjusting method and terminal |
| CN107025885B (en) | 2017-06-14 | 2019-06-21 | 京东方科技集团股份有限公司 | A kind of backlight light emission luminance adjusts circuit, backlight light emission luminance regulating system and method |
| CN110534063B (en) * | 2018-05-23 | 2021-01-22 | 奇景光电股份有限公司 | Backlight source adjusting method for regional dimming and display device |
| CN109036334B (en) * | 2018-09-26 | 2021-05-14 | 惠科股份有限公司 | Brightness control method and device of display device |
| CN109192149B (en) * | 2018-10-31 | 2020-05-15 | 京东方科技集团股份有限公司 | Backlight driving device and driving method thereof, backlight module and display device |
| CN113571023B (en) * | 2021-08-03 | 2022-08-05 | 深圳市视显光电技术有限公司 | Backlight multi-partition brightness statistical method and device based on FPGA |
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