CN101625835A - Method for enhancing contrast - Google Patents
Method for enhancing contrast Download PDFInfo
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- CN101625835A CN101625835A CN200810136041A CN200810136041A CN101625835A CN 101625835 A CN101625835 A CN 101625835A CN 200810136041 A CN200810136041 A CN 200810136041A CN 200810136041 A CN200810136041 A CN 200810136041A CN 101625835 A CN101625835 A CN 101625835A
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Abstract
The invention provides a method for enhancing the contrast, which is suitable for a display device, wherein the display device comprises a back light module and has a maximum brightness value. The method for enhancing the contrast comprises the following steps: receiving picture signals continuously in each unit time; calculating the proportion of a picture brightness value corresponding to each picture signal and the maximum brightness value continuously and setting the proportion as instantaneous relative brightness; setting a first proportion, first adjusting time, a second proportion and second adjusting time; adjusting and lowering the brightness of the back light module to minimum brightness gradually in the first adjusting time when the instantaneous relative brightness is smaller than the first proportion; and adjusting and increasing the brightness of the back light module to maximum brightness gradually in the second adjusting time when the instantaneous relative brightness is greater than the second proportion.
Description
Technical field
The present invention relates to a kind of contrast method for improving that is applied to display device, particularly a kind of contrast of LCD degree method for improving that is applied to.
Background technology
In recent years, the rapid technological improvement of LCD, and also constantly decline of manufacturing cost make LCD (LCD) almost completely replace the market of conventional cathode ray tube (CRT) on monitor.And along with the progress of lcd technology, grow up especially apace in the market of LCD TV, and also more and more higher to the performance requirement of LCD TV.LCD TV has plurality of advantages compared to traditional CRT TV, and for example: volume is ultra-thin, picture is bigger, resolution significantly improves etc.Yet LCD TV also has its weakness, and for example: contrast is not as traditional C RT TV, and this is because the backlight module of LCD TV is lighted always, and when dark picture, the character of liquid crystal own makes so, difficult light is blocked fully, causes due to a little light leak.Therefore how improving contrast becomes the emphasis that lcd technology remains to be broken through.
At present prior art is in order to promote contrast, according to the height of the overall brightness value of picture, adjusts brightness of backlight module immediately usually.For example: when the overall brightness value of picture to display is hanged down, turn down brightness of backlight module immediately; When the overall brightness value of picture to display is higher, then heighten brightness of backlight module immediately.Yet this method causes film flicker and flickering phenomenon easily, makes when human eye is watched uncomfortablely, and then causes the problem of visual fatigue easily.Simultaneously, when adjusting brightness of backlight module fast and continually, can reduce the serviceable life of backlight module significantly.On the other hand, when dark picture, because turning down of backlight module brightness though can improve contrast, can make whole picture become comparatively obscure.
In order to overcome the problems referred to above, the present invention proposes brand-new notion and solution, can effectively solve film flicker, uncomfortable problem when watching, and can promote the contrast of LCD simultaneously.
Summary of the invention
The invention provides a kind of method that the contrast of LCD degree promotes that can be applicable to, can promote the contrast of LCD.
The invention provides a kind of contrast method for improving, be applicable to display device, wherein, described display device comprises backlight module and has maximum brightness value that described method comprises: continue to receive picture signal at per unit in the time; Continue to calculate the picture brightness value of the pairing picture of each picture signal and the ratio of described maximum brightness value, and described ratio is set at instant relative brightness; Set first ratio and the first adjustment time; When described instant relative brightness during, described brightness of backlight module was turned down gradually to minimum brightness in the described first adjustment time less than described first ratio; Set second ratio and the second adjustment time; And, described brightness of backlight module is heightened to high-high brightness in the described second adjustment time gradually when described instant relative brightness during greater than described second ratio.
The present invention also provides a kind of contrast method for improving, is applicable to display device, and wherein, described display device comprises backlight module and have maximum brightness value that described method comprises: continue to receive picture signal at per unit in the time; Continue to calculate the picture brightness value of the pairing picture of each picture signal and the ratio of described maximum brightness value, and described ratio is set at instant relative brightness; Set first ratio, first surge time and the first adjustment time; When continuous a plurality of instant relative brightnesses when reaching continuous time of described first ratio described first surge time, described brightness of backlight module was turned down gradually to minimum brightness in the described first adjustment time; Set second ratio, second surge time and the second adjustment time; And when continuous a plurality of instant relative brightnesses when reaching continuous time of described second ratio described second surge time, described brightness of backlight module is heightened to high-high brightness in the described second adjustment time gradually.
According to above-mentioned conception, wherein, described display device comprises a plurality of pixels, and described maximum brightness value is the summation of high gray-scale value of all each pixels, and the summation of the gray-scale value that described instant relative brightness is the light that all each pixels are sent in the described picture is divided by described maximum brightness value.
According to above-mentioned conception, wherein, described display device comprises a plurality of pixels, and in that described brightness of backlight module is turned down in the step of minimum brightness in the described first adjustment time gradually, also the former gray-scale value of all each pixels is adjusted to the compensating for gray-scale value gradually.
According to above-mentioned conception, wherein, described brightness of backlight module is being heightened in the step of high-high brightness in the described second adjustment time gradually, also the compensating for gray-scale value with all each pixels adjusts back to described former gray-scale value gradually.
According to above-mentioned conception, wherein, the scope of described first ratio is between 8-12%.
According to above-mentioned conception, wherein, described first surge time is 2-5 second.
According to above-mentioned conception, wherein, the described first adjustment time was greater than 5 seconds.
According to above-mentioned conception, wherein, the scope of described second ratio is between 17-25%.
According to above-mentioned conception, wherein, described second surge time was less than 3 seconds.
According to above-mentioned conception, wherein, the described second adjustment time was greater than 2 seconds.
The present invention also provides a kind of display device, comprising: receiving element, in order to receive picture signal; Computing element, in order to the brightness value that the calculates described picture signal ratio with respect to the maximum brightness value of described display device, setting described ratio is brightness ratio; Backlight module; And control element, in order to magnitude relationship, adjust described brightness of backlight module according to described brightness ratio and preset ratio.
According to above-mentioned conception, wherein, described preset ratio also comprises first preset ratio and second preset ratio; When described brightness ratio during less than described first preset ratio, described control element is turned down described brightness of backlight module; When described brightness ratio during greater than described second preset ratio, described control element is heightened described brightness of backlight module.
According to above-mentioned conception, wherein, described control element is set first control time and second control time; When described brightness ratio during less than described first preset ratio, described control element is turned down described brightness of backlight module in described first control time; When described brightness ratio during greater than described second preset ratio, described control element is heightened described brightness of backlight module in described second control time.
According to above-mentioned conception, wherein, described control element is set first surge time and second surge time; When described brightness ratio in first surge time during all less than described first preset ratio, described control element is turned down described brightness of backlight module; When described brightness ratio in second surge time during all greater than described second preset ratio, described control element is heightened described brightness of backlight module.
By following detailed description, can understand the present invention in more detail.
Description of drawings
Fig. 1 is the brightness of backlight module adjustment process synoptic diagram of first embodiment of the invention.
Fig. 2 is a gray-scale value compensated curve of the present invention.
Fig. 3 is the brightness of backlight module adjustment process synoptic diagram of second embodiment of the invention.
Fig. 4 is the synoptic diagram of the display device of third embodiment of the invention.
[explanation of major part conventional letter]
1: display device
10: receiving element
20: computing element
30: control element
40: backlight module
T
10, T
11, T
12, T
13, T
14, T
20, T
21, T
22, T
23, T
24, T
25, T
26: time point
I
Max, I '
Max: maximum brightness
I
Min, I '
Min: minimum brightness
Embodiment
The present invention will further describe in detail by following preferred embodiment and conjunction with figs..
[first embodiment]
Fig. 1 is the brightness of backlight module adjustment process synoptic diagram of first embodiment of the invention.Generally speaking, LCD TV (or LCD) is play 60 pictures approximately in one second, therefore every 1/60 second, just has a new picture and shows.With reference to Fig. 1, transverse axis is a time shaft, and its top is that the total luminance value of the picture of each time point is with respect to the ratio of LCD TV maximum brightness value along with the time carries out, and the present invention is called instant brightness ratio.The total luminance value of each picture can be calculated by the picture signal of input, and this picture signal may even connect the optical fiber etc. of internet from the concentric cable of DVD player, Blu-ray Disc player, CATV (cable television), the hard disk that has image electronics shelves or storage card.
The computing method of maximum brightness value can multiply by total pixel (containing sub-pixel) of LCD TV (or LCD) with maximum gradation value.For example: when gray-scale value is divided into 256 rank (8bit), wherein the 0th rank are the darkest, and the 255th rank are the brightest, and LCD TV has 2,000,000 pixels, wherein each pixel comprise three each will send the sub-pixels of Red Green Blue light, then maximum brightness value is 255 to multiply by 2,000,000 and multiply by 3 again, promptly 1,530,000,000.If gray-scale value is when being divided into 1024 rank (10bit), wherein the 0th rank are the darkest, and the 1023rd rank are the brightest, and LCD TV has 2,000,000 pixels, and then maximum brightness value is 1023 to multiply by 2,000,000 and multiply by 3 again, promptly 6,138,000,000.In addition, the computing method of the total luminance value of each picture then can be the summation of the gray-scale value of all each sub-pixels in this picture.At last, the total luminance value that instant brightness ratio is each picture is divided by maximum brightness value, resulting ratio.
Certainly, the computing method of this instant brightness ratio also can adopt weighting (weighting) Calculation Method.For example a certain section gray-scale value be multiply by a bigger or lower weighted value, also can be weighted calculating, or be weighted calculating simultaneously at some gray-scale value and some color at certain color.
With reference to Fig. 1, above transverse axis the instant brightness ratio of the picture of each time point, below transverse axis the brightness of backlight module adjustment process of corresponding each time point.When time point was started from scratch, the instant brightness ratio of picture was 100%, and as time passes, instant brightness ratio begins to arrive T toward descending
10During time point, when instant brightness ratio dropped to 10% preset ratio, present embodiment promptly started to the turning down of backlight module brightness, from maximum brightness I
MaxDown turn down brightness gradually, to T
11During time point, minimum brightness I is reduced in brightness
MinIn the present embodiment, from T
10To T
11Be set at 9 seconds.The slow gradually design of falling of this kind brightness can be avoided the user to feel picture deepening suddenly, and uncomfortable sensation is arranged.
Fig. 2 is a gray-scale value compensated curve of the present invention.With reference to Fig. 2, gray-scale value compensated curve of the present invention about gray-scale value be compensation in 32 o'clock at most, the brightest and the darkest then uncompensation, then compensate for slower is many near 32 low gray-scale value for gray-scale value.The compensation of this gray-scale value can make dark picture be unlikely to become obscure, and can make picture seem that distinct stereovision is more arranged.
In the present embodiment, when backlight module brightness from T
10Beginning is turned down brightness gradually to T
11In the process that finishes, the gray-scale value compensate function also starts synchronously, also is about to the script gray-scale value of each pixel, from T
10To T
11In 9 seconds of setting, heighten pairing compensating for gray-scale value gradually.Because the process of heightening rises for slow,, and uncomfortable sensation is arranged so the user can not feel that picture suddenly brightens.
Refer again to Fig. 1, when time point from T
11To T
12In the process, because instant brightness ratio all is lower than 10% preset ratio, so brightness of backlight module still maintains minimum brightness I
MinConstant.From T
12Beginning, instant brightness ratio begins toward rising, to T
13During time point, instant brightness ratio surpasses another preset ratio of 20%, just starts heightening backlight module brightness this moment.With brightness by minimum brightness I
MinUp heighten, to T
14During time point, the brightness brightness I that turns up full blast
MaxIn the present embodiment, from T
13To T
14Be set at 2 seconds.Similarly, because the process of heightening rises for slow,, and dazzling uncomfortable sensation is arranged so the user can not feel that picture suddenly brightens.
In the present embodiment, when backlight module brightness from T
13Beginning is heightened brightness gradually to T
14In the process that finishes, also recalling to of gray-scale value compensation starts synchronously, also is about to the compensating for gray-scale value of each pixel, from T
13To T
14In 2 seconds of setting, turn down gradually and get back to pairing script gray-scale value.
Comprehensively above-mentioned, in the present embodiment, set instant brightness ratio and be backlight module brightness can be transferred to minimum brightness in the active region below 10%; Set instant brightness ratio and be buffer zone 10% to 20%, when setting instant brightness ratio from 10% past the rising, must surpass 20%, just begin backlight module brightness is up heightened by minimum brightness, in order to avoid start the adjustment function of backlight module brightness too continually, influence the life-span of backlight module lamp tube.
[second embodiment]
Fig. 3 is the brightness of backlight module adjustment process synoptic diagram of second embodiment of the invention.The instant brightness ratio and first embodiment of each time point of present embodiment are identical, also promptly import identical picture signal, implement different to the method for adjustment of backlight module brightness so that help comparison present embodiment and first.In this enforcement, introduced the notion of surge time especially, further avoided starting too continually the adjustment function of backlight module brightness, be described in detail as follows.
With reference to Fig. 3, when time point was started from scratch, the instant brightness ratio of picture was 100%, and as time passes, instant brightness ratio begins to arrive T toward descending
20During time point, when instant brightness ratio dropped to 10% preset ratio, this enforcement started clocking capability.When from T
20Arrive T
21During this period of time, reached default surge time (for example being set at 3 seconds), just started the adjustment function of backlight module brightness at this moment because instant brightness ratio remains on the time that continues 10% below to accumulate always, with brightness by maximum brightness I '
MaxDown turn down brightness gradually, to T
22During time point, minimum brightness I ' is reduced in brightness
Min
In the present embodiment, from T
21To T
22Be set at 9 seconds.The slow gradually design of falling of this brightness can avoid the user to feel picture deepening suddenly, and uncomfortable sensation is arranged or do not see the situation of Chu.
The present embodiment and first embodiment have equally also introduced the gray-scale value compensate function.With reference to Fig. 2, when backlight module brightness from T
21Beginning is turned down brightness gradually up to T
22In the process that finishes, the gray-scale value compensate function also starts synchronously, also is about to the script gray-scale value of each pixel, from T
21To T
22In 9 seconds of setting, heighten pairing compensating for gray-scale value gradually.Because the process of heightening rises for slow,, and uncomfortable sensation is arranged so the user can not feel that picture suddenly brightens.The compensation of this gray-scale value can make dark picture be unlikely to become obscure, and can make picture seem that distinct stereovision is more arranged.
Continuation is with reference to Fig. 3, when time point from T
22To T
23In the process, because instant brightness ratio all is lower than 10% preset ratio, so brightness of backlight module still maintains minimum brightness I '
MinConstant.From T
23Beginning, instant brightness ratio begins toward rising, to T
24During time point, instant brightness ratio surpasses another preset ratio of 20%, just starts clocking capability this moment.From T
24Arrive T
25During this period of time, reached default surge time (for example being set at 0.5 second), just started the adjustment function of backlight module brightness at this moment because instant brightness ratio remains on the time that continues 20% or more to accumulate always, with brightness by minimum brightness I '
MinUp heighten brightness gradually, to T
26During time point, brightness is heightened to maximum brightness I '
Max
In the present embodiment, from T
25To T
26Be set at 2 seconds.Similarly, because the process of heightening rises for slow,, and dazzling uncomfortable sensation is arranged so the user can not feel that picture suddenly brightens.
Present embodiment is at T
25To T
26The heightening in the process of backlight module brightness, similarly introduce the action of recalling to of gray-scale value compensation with first embodiment, also use slow mode of falling, detailed content no longer repeats.
[the 3rd embodiment]
Consult Fig. 4, it is the synoptic diagram of the display device of third embodiment of the invention.Present embodiment proposes a kind of display device 1, and it has the effect that promotes contrast.Display device 1 can be that LCD (for example being LCD TV) or other need the display device of backlight module.Display device 1 (for example being LCD TV) comprises receiving element 10, computing element 20, control element 30 and backlight module 40.
Receiving element 10 can be used for receiving picture signal, and this picture signal may even connect the optical fiber etc. of internet (Internet) from the concentric cable of DVD player, Blu-ray Disc player, CATV (cable television), the hard disk that has image electronics shelves or storage card or tape.
Control element 30 can be an IC chip, and the brightness value ratio that can be calculated according to computing element 20 is carried out the comparison of magnitude relationship with one or more preset ratio, again according to comparative result, controls the brightness of whether adjusting backlight module 40.It relatively and the method for control can be as described in first and second embodiment, adopts that brightness is slowly fallen, the slow liter, and the notion etc. of introducing surge time.Detailed content is with reference to first and second embodiment.In addition, the comparison of control element 30 and the method for control also can be adopted the method outside the described method of first and second embodiment.
The computing element 20 of present embodiment can be two IC chips that separate with control element 30, also can be integrated into an IC chip, even can integrate with the IC chip of backlight module or other IC chip in the display device.
The display device 1 of present embodiment can dynamically be adjusted brightness of backlight module according to the brightness value of picture, can improve contrast.
In sum, this case provides the display device with high-contrast, and several contrast method for improving, it can be applicable to liquid crystal indicator or other has the display device of backlight module, by calculating the brightness value of picture, dynamically adjust brightness of backlight module, and use brightness to delay and fall or the slow method that rises, and introduced the method for surge time, dazzling situation be can avoid, or backlight module brightness, the film flicker that is caused adjusted too continually, simultaneously can also improve the contrast of LCD degree, promote image quality.
Those skilled in the art can carry out various modifications to the present invention, and can not break away from the defined protection domain of claims.
Claims (22)
1, a kind of contrast method for improving is applicable to display device, and wherein, described display device comprises backlight module and have maximum brightness value that described method comprises:
In each unit interval, receive picture signal constantly;
Calculate the picture brightness value of the pairing picture of each described picture signal and the ratio of described maximum brightness value constantly, and described ratio is set at instant relative brightness;
Set first ratio and the first adjustment time;
When described instant relative brightness during, described brightness of backlight module was turned down gradually to minimum brightness in the described first adjustment time less than described first ratio;
Set second ratio and the second adjustment time; And
When described instant relative brightness during, described brightness of backlight module is heightened to high-high brightness in the described second adjustment time gradually greater than described second ratio.
2, the method for claim 1, wherein, described display device comprises a plurality of pixels, and described maximum brightness value is the summation of high gray-scale value of all each described pixels, and the summation of the gray-scale value that described instant relative brightness is the light that all each described pixels are sent in the described picture is divided by described maximum brightness value.
3, the method for claim 1, wherein, described display device comprises a plurality of pixels, and, also the former gray-scale value of all each described pixels is adjusted to the compensating for gray-scale value gradually in the described first adjustment time in that described brightness of backlight module is turned down in the step of minimum brightness gradually.
4, method as claimed in claim 3, wherein, described brightness of backlight module is being heightened in the step of high-high brightness in the described second adjustment time gradually, and also the described compensating for gray-scale value with all each described pixels adjusts back to described former gray-scale value gradually.
5, the scope of the method for claim 1, wherein described first ratio is between 8-12%.
6, the method for claim 1, wherein described first adjustment time was greater than 5 seconds.
7, the scope of the method for claim 1, wherein described second ratio is between 17-25%.
8, the method for claim 1, wherein described second adjustment time was greater than 2 seconds.
9, a kind of contrast method for improving is applicable to display device, and wherein, described display device comprises backlight module and have maximum brightness value that described method comprises:
In each unit interval, receive picture signal constantly;
Calculate the picture brightness value of the pairing picture of each described picture signal and the ratio of described maximum brightness value constantly, and described ratio is set at instant relative brightness;
Set first ratio, first surge time and the first adjustment time;
When continuous a plurality of described instant relative brightnesses when reaching continuous time of described first ratio described first surge time, described brightness of backlight module was turned down gradually to minimum brightness in the described first adjustment time;
Set second ratio, second surge time and the second adjustment time; And
When continuous a plurality of described instant relative brightnesses when reaching continuous time of described second ratio described second surge time, described brightness of backlight module is heightened to high-high brightness in the described second adjustment time gradually.
10, method as claimed in claim 9, wherein, described display device comprises a plurality of pixels, and described maximum brightness value is the summation of high gray-scale value of all each described pixels, and the summation of the gray-scale value that described instant relative brightness is the light that all each described pixels are sent in the described picture is divided by described maximum brightness value.
11, method as claimed in claim 9, wherein, described display device comprises a plurality of pixels, and, also the former gray-scale value of all each described pixels is adjusted to the compensating for gray-scale value gradually in the described first adjustment time in that described brightness of backlight module is turned down in the step of minimum brightness gradually.
12, method as claimed in claim 11, wherein, described brightness of backlight module is being heightened in the step of high-high brightness in the described second adjustment time gradually, and also the described compensating for gray-scale value with all each described pixels adjusts back to described former gray-scale value gradually.
13, method as claimed in claim 9, wherein, the scope of described first ratio is between 8-12%.
14, method as claimed in claim 9, wherein, described first surge time is 2-5 second.
15, method as claimed in claim 9, wherein, the described first adjustment time was greater than 5 seconds.
16, method as claimed in claim 9, wherein, the scope of described second ratio is between 17-25%.
17, method as claimed in claim 9, wherein, described second surge time was less than 3 seconds.
18, method as claimed in claim 9, wherein, the described second adjustment time was greater than 2 seconds.
19, a kind of display device comprises:
Receiving element is in order to receive picture signal;
Computing element, in order to the brightness value that the calculates described picture signal ratio with respect to the maximum brightness value of described display device, establishing described ratio is brightness ratio;
Backlight module; And
Control element in order to the magnitude relationship according to described brightness ratio and preset ratio, is adjusted described brightness of backlight module.
20, display device as claimed in claim 19, wherein, described preset ratio further comprises first preset ratio and second preset ratio; When described brightness ratio during less than described first preset ratio, described control element is turned down described brightness of backlight module; When described brightness ratio during greater than described second preset ratio, described control element is heightened described brightness of backlight module.
21, display device as claimed in claim 20, wherein, described control element is set the first adjustment time and the second adjustment time; When described brightness ratio during less than described first preset ratio, described control element is turned down described brightness of backlight module in the described first adjustment time; When described brightness ratio during greater than described second preset ratio, described control element is heightened described brightness of backlight module in the described second adjustment time.
22, display device as claimed in claim 20, wherein, described control element is set first surge time and second surge time; When described brightness ratio in described first surge time during all less than described first preset ratio, described control element is turned down described brightness of backlight module; When described brightness ratio in described second surge time during all greater than described second preset ratio, described control element is heightened described brightness of backlight module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531166A (en) * | 2010-06-28 | 2014-01-22 | 瀚宇彩晶股份有限公司 | Method for improving image contrast of display device |
| CN105657301A (en) * | 2016-02-22 | 2016-06-08 | 深圳市华星光电技术有限公司 | Image displaying method and device |
| CN108267459A (en) * | 2018-01-19 | 2018-07-10 | 凌云光技术集团有限责任公司 | A kind of method and device of backlight detection printed matter low contrast defect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6157814A (en) * | 1984-08-29 | 1986-03-24 | Hitachi Ltd | Electronic instrument board |
| CA2415340C (en) * | 2001-04-25 | 2006-05-16 | Masahiro Kawashima | Video display apparatus and method which controls the source light level using apl detection |
| JP4442492B2 (en) * | 2005-04-04 | 2010-03-31 | 日本電気株式会社 | Planar light source device, display device, terminal device, and planar light source device driving method |
| KR101174782B1 (en) * | 2005-06-30 | 2012-08-20 | 엘지디스플레이 주식회사 | Apparatus and Method for Driving Liquid Crystal Display Device |
| CN101149902A (en) * | 2006-09-20 | 2008-03-26 | 南京Lg同创彩色显示系统有限责任公司 | Image display instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531166A (en) * | 2010-06-28 | 2014-01-22 | 瀚宇彩晶股份有限公司 | Method for improving image contrast of display device |
| CN105657301A (en) * | 2016-02-22 | 2016-06-08 | 深圳市华星光电技术有限公司 | Image displaying method and device |
| CN105657301B (en) * | 2016-02-22 | 2019-06-11 | 深圳市华星光电技术有限公司 | Show the method and device of image |
| CN108267459A (en) * | 2018-01-19 | 2018-07-10 | 凌云光技术集团有限责任公司 | A kind of method and device of backlight detection printed matter low contrast defect |
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