CN100505006C - Method and device for regulating display brightness according to image - Google Patents
Method and device for regulating display brightness according to image Download PDFInfo
- Publication number
- CN100505006C CN100505006C CNB2006100738957A CN200610073895A CN100505006C CN 100505006 C CN100505006 C CN 100505006C CN B2006100738957 A CNB2006100738957 A CN B2006100738957A CN 200610073895 A CN200610073895 A CN 200610073895A CN 100505006 C CN100505006 C CN 100505006C
- Authority
- CN
- China
- Prior art keywords
- display
- target
- control voltage
- picture
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a method for defining maximum luminance of a display. Said display is used for displaying an object picture containing several object pixels, every object pixel has an object grey level. Said object picture and N adjacent pictures respectively have a maximum grey level, and said display can display M kinds of preset grey levels. Firstly, according to said several maximum grey levels said invention can selectively produce a reference grey level copyright for said object picture. Then said invention can select out an object control voltage correspondent to R from search list, and produce a gain according R and M. Then every object grey level is multiplied by said gain respectively, so that several new grey levels can be produced. Finally, said invention can use said object control voltage as control voltage of said display, and utilize said several new grey levels to display said object picture.
Description
Technical field
The present invention is about a kind of management method and device that is applied in the display, and especially, the present invention is about a kind of method and device of adjusting the brightness of display according to picture characteristics.
Background technology
Generally speaking, adopt the luminosity of the LCD fixed light source of back light (back light source), utilize the anglec of rotation of liquid crystal molecule to control the light transmission capacity that passes liquid crystal molecule again; Can change the brightness that is presented on user's picture at the moment with this.On the other hand, a picture normally is made up of a plurality of pixels with different gray-scale values (just different brightness).Corresponding to different gray-scale values, the anglec of rotation of each liquid crystal molecule also has nothing in common with each other in the display.With the display that can show 256 kinds of gray-scale values is example, and gray-scale value 255 is corresponding to maximum brightness, and gray-scale value 0 then is corresponding to minimum brightness.See also Fig. 1, Fig. 1 represents the example of the relation of a gray scale and brightness.By this example as can be seen, the gray-scale value of LCD roughly is directly proportional with brightness.
In fact, may not every picture all include pixel corresponding to gray-scale value 255.The highest pixel of brightness may be only corresponding to gray-scale value about 200 in some picture, and is perhaps lower.In the prior art, even the highest pixel of brightness is only corresponding to gray-scale value 200 in a certain picture, the brightness that can provide at least corresponding to gray-scale value 255 still is provided the luminosity of the light source of LCD.Under these circumstances, the luminosity of light source is not just utilized fully, and the liquid crystal molecule after the light of some can be rotated covers.Therefore, during in order to the lower picture of display brightness, the light source of LCD may only have been brought into play 80 effect of percentage, also has 20 light of percentage not to be fully utilized.
As is known to the person skilled in the art, the power consumption of backlight liquid crystal display light source is very big, sometimes even accounted for the 70%-80% of display whole power consumption.The brightness of back light is higher, and the power of display consumes is just bigger.In addition, in the process of LCD running, the light source of LCD remains on the state of unlatching regularly.Obviously, the above-mentioned not high problem of light source utilization ratio can cause many unnecessary power dissipation.
Summary of the invention
For addressing the above problem, the invention provides a kind of method and device of adjusting the brightness of display according to picture characteristics.With the backlight liquid crystal display light source is example, and the luminosity of this light source has fixing relation with a control voltage usually.Therefore, the method according to this invention and device can be by adjusting the brightness that this control voltage changes display.Because the present invention can be according to showing that each opens the brightness that the light source of display is adjusted in the needed brightness of image, but not as prior art the brightness of light source is made as definite value, so can significantly promote the utilization ratio of light source.
Suppose that this display can show that altogether the M kind presets gray-scale value, and in order to show the target picture in the video signal flow (video stream).In this video signal flow, this target picture is adjacent to N contiguous picture.This target picture and each this vicinity picture have a maximum gradation value separately.This target picture comprises a plurality of object pixels, and each this object pixel has a target gray value.
A preferred embodiment according to the present invention is an a kind of control voltage method that determines a display.This control method is at first optionally according to these a plurality of maximum gradation value, for this target picture produces a reference gray level value (R).Then, this method is by a target control voltage of selecting in the look-up table (look-up table) corresponding to this reference gray level value (R).According to this reference gray level value (R) and M, this method can produce gain (gain) M/R.Respectively each this target gray value be multiply by this gain, these a plurality of object pixels that promptly can be in this target picture produce a plurality of new gray-scale values.At last, this method is set at this control voltage of this display with this target control voltage, and with these a plurality of new gray-scale values this target picture is shown on this display.
Another preferred embodiment according to the present invention is a kind of device that determines a control voltage of a display.This control device comprises a generation module, and selects module, a gain module, a multiplier module and a setting module.This generation module is in order to optionally to produce a reference gray level value (R) according to these a plurality of maximum gradation value for this target picture.This selection module is in order to by a target control voltage of selecting in the look-up table corresponding to this reference gray level value (R).This gain module then is in order to produce a gain M/R according to this reference gray level value (R) with M.This multiplier module is in order to multiply by this gain with each this target gray value respectively, and these a plurality of object pixels in this target picture produce a plurality of new gray-scale values.This setting module is in order to being set at this target control voltage this control voltage of this display, and with these a plurality of new gray-scale values this target picture is shown on this display.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 represents the example of the relation of a gray scale and brightness.
Fig. 2 represents the process flow diagram according to the control method of first preferred embodiment of the present invention.
Fig. 3 represents the calcspar according to the control device of second preferred embodiment of the present invention
The main element symbol description
S21-S25: process step 30: control device
31: generation module 32: select module
33: gain module 34: multiplier module
35: setting module 36: look-up table
Embodiment
Fundamental purpose of the present invention provides a kind of method and device of adjusting the brightness of display according to picture characteristics.
Back light with LCD screen is an example, and the luminosity of this light source has fixing relation with a control voltage usually.Therefore, the method according to this invention and device can be by adjusting the brightness that this control voltage changes display.
Suppose that this LCD to be ready being used to show the target picture in the video signal flow, and in this video signal flow, this target picture is adjacent to N contiguous picture.For example, if N equals 32, this N contiguous picture may be to appear at this target picture 32 pictures before.This target picture is made up of a plurality of object pixels, and each this object pixel has a corresponding target gray value respectively.
In addition, this vicinity picture of this target picture and each has a corresponding maximum gradation value separately.And maximum gradation value can utilize different judgment modes to produce, for example: the maximum gradation value of specific picture can be the highest gray-scale value of brightness in this picture, can also be the average or the weighted mean of getting whole gray-scale values in the specific picture ... etc., or the picture characteristics figure of specific picture added up resulting threshold value (threshold), that is be that area by the computed image performance plot decides, by the high gray-scale value part of entire image performance plot direction integral to low gray-scale value part, when the ratio of the integral area and the total area reached setting value, its corresponding gray scale value promptly can be used as maximum gradation value.
The present invention utilizes instrument in advance, under fixing control voltage (for example 5 volts), and the pairing brightness of various different gray-scale values (example as shown in Figure 1) of measuring a display.Then, the present invention can set up the table of comparisons of a gray-scale value and brightness according to above-mentioned measurement result.See also table one, table one is the example of this table of comparisons.
The example of the table of comparisons of table one, gray-scale value and brightness
Suppose that this display can show that altogether the M kind presets gray-scale value (M is a positive integer), then this table of comparisons just may comprise M corresponding relation.In existing display system, M is generally equal to 256.Table one only is the example in order to signal, therefore unlisted all gray-scale values and corresponding brightness thereof.
Except the relation of gray-scale value and brightness, the present invention also finds out in advance under the situation of gray-scale value 255, the corresponding relation of the brightness of various control magnitudes of voltage (unit is a volt) and light source.See also table two, table two is the example of this corresponding relation.
The example (gray-scale value 255) of the corresponding relation of table two, control voltage and brightness
The maximum gradation value of supposing this target picture is 175, and we can be by finding out in the table one that gray-scale value 175 pairing brightness are 339.71.That is to say, show that the needed maximum brightness of this target picture is 339.71, but not gray-scale value 255 pairing brightness 505.38.Next, we are by finding out in the table two, and when control voltage equaled 1.6 volts, gray-scale value 255 pairing brightness were 340.4.Can push away thus, when control voltage equaled 1.6 volts, gray-scale value 255 pairing maximum brightnesses promptly were enough to present this target picture.
Can utilize above-mentioned corresponding relation according to control method of the present invention or control device, the target control voltage with light source when showing this target picture is set at 1.6 volts, even also the highest luminosity of the light source of this display equals 340.4.With this, the present invention can keep the original maximum brightness of this target picture, and the highest luminosity of the light source of this display can be come down to 340.4 by 505.38, significantly to reduce the power consumption of this light source.
Except setting this target control voltage, the present invention also must do a corresponding adjustment with the target gray value of each object pixel in this target picture.For example, the maximum gradation value of this target picture must be multiplied by a gain, is adjusted to 255 by 175, just can keep the original high-high brightness of this target picture.Relatively, each target gray value all must be multiplied by identical yield value, for each object pixel in this target picture produces new gray-scale value.
In sum, first preferred embodiment according to the present invention is a kind of this control voltage method that determines a display.See also Fig. 2.Fig. 2 is the process flow diagram of this control method.Step S21 is at first optionally according to the maximum gradation value of this target picture with these a plurality of contiguous pictures, for this target picture produces a reference gray level value (R).Then, step S22 is by a target control voltage of selecting in the look-up table corresponding to this reference gray level value (R).Step S23 produces a gain according to this reference gray level value (R) with M.Step S24 then multiply by this gain with each this target gray value respectively, for these a plurality of object pixels in this target picture produce a plurality of new gray-scale values.At last, step S25 is set at this control voltage of this display with this target control voltage, and with these a plurality of new gray-scale values this target picture is shown on this display.
Wherein, if this gain equals the ratio (M/R) of displayable gray-scale value of display (M) and reference gray level value (R), the gain in the above-mentioned example then equals (255/175).The maximum gradation value of this target picture will be adjusted to 255 by 175 after multiply by this gain (for example 255/175).Similarly, each this target gray value all must be multiplied by this gain (255/175) in this target picture, to keep the relative scale of original gray-scale value.
In practical application, this look-up table can be the single table of comparisons behind integration table one and the table two, in order to store the many groups corresponding relation between this reference gray level value (R) and this target control voltage.In addition, the DC voltage that this target control voltage can be as shown in Table 2 also can be a width modulation (pulse widthmodulation, PWM) square wave.
In fact, reference gray level value (R) may not be the maximum gradation value of this target picture itself, but the mean value of the maximum gradation value of this N contiguous picture.Because this target picture may be subjected to noise, causes the maximum gradation value of this target picture that abnormal phenomenon higher or on the low side is arranged.Therefore, adopt the mean value of the maximum gradation value of contiguous picture can eliminate The noise, avoid the brightness of this target picture to produce abnormal change.For example, the reference gray level value (R) of this target picture can be the mean value of the maximum gradation value of preceding 32 contiguous pictures.
Second preferred embodiment according to the present invention is a kind of device that determines a control voltage of a display.Fig. 3 is the calcspar of this control device.Control device 30 comprises a generation module 31, and selects module 32, a gain module 33, a multiplier module 34 and a setting module 35.This generation module 31 is in order to optionally to produce a reference gray level value (R) according to these a plurality of maximum gradation value for this target picture.This selection module 32 is in order to by a target control voltage of selecting in the look-up table 36 corresponding to this reference gray level value (R).33 of this gain modules are in order to produce a gain according to this reference gray level value (R) with M.This multiplier module 34 is in order to multiply by this gain with each this target gray value respectively, and these a plurality of object pixels in this target picture produce a plurality of new gray-scale values.This setting module 35 is in order to being set at this target control voltage this control voltage of this display, and with these a plurality of new gray-scale values this target picture is shown on this display.
Behind the control voltage of the light source that reduces display, the present invention still can keep the original maximum brightness of this target picture, and can significantly reduce the power consumption of this light source.Compared to prior art, use display of the present invention and can save many unnecessary power consumptions.In addition, reduce control voltage and light-source brightness the temperature of display is descended, prolong the serviceable life of display pannel.
As is known to the person skilled in the art, when gray-scale value equaled 0, the brightness of display was not to be equal to zero, just has the phenomenon of so-called light leak.According to the present invention, the maximum brightness that reduces light source also can relatively allow the light leak amount of screen reduce.Therefore, under the situation constant in the maximum brightness of target picture, that minimum brightness reduces, the overall contrast of picture can improve relatively.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim scope of being arranged in of various changes and equivalence institute of the present invention desire application.
Claims (8)
1, an a kind of control voltage method that determines a display, this control voltage is relevant with a maximum brightness of this display, this display is in order to show the target picture in the video signal flow (video stream), in this video signal flow, this target picture is adjacent to N contiguous picture, N is a positive integer, this target picture and each this vicinity picture have a maximum gradation value separately, this target picture comprises a plurality of object pixels, each this object pixel has a target gray value, this display can show that altogether the M kind presets gray-scale value, and M is a positive integer, and this method comprises the following step:
Optionally according to these a plurality of maximum gradation value, for this target picture produces a reference gray level value (R);
By a target control voltage of selecting in the look-up table corresponding to this reference gray level value (R);
Produce a gain M/R according to this reference gray level value (R) with M;
Respectively each this target gray value be multiply by this gain, these a plurality of object pixels in this target picture produce a plurality of new gray-scale values; And
This target control voltage is set at this control voltage of this display, and this target picture is shown on this display with these a plurality of new gray-scale values.
2, the method for claim 1, wherein this display is the LCD screen of an employing back light.
3, the method for claim 1, wherein this target control voltage is a direct current voltage or a width modulation square wave.
4, the method for claim 1, wherein this look-up table is in order to store the many groups corresponding relation between this reference gray level value (R) and this target control voltage.
5, a kind of device that determines a control voltage of a display, this control voltage is relevant with a maximum brightness of this display, this display is in order to show the target picture in the video signal flow (video stream), in this video signal flow, this target picture is adjacent to N contiguous picture, N is a positive integer, this target picture and each this vicinity picture have a maximum gradation value separately, this target picture comprises a plurality of object pixels, each this object pixel has a target gray value, this display can show that altogether the M kind presets gray-scale value, and M is a positive integer, and this device comprises:
One generation module is in order to optionally to produce a reference gray level value (R) according to these a plurality of maximum gradation value for this target picture;
One selects module, in order to by a target control voltage of selecting in the look-up table corresponding to this reference gray level value (R);
One gain module is in order to produce a gain M/R according to this reference gray level value (R) with M;
One multiplier module, in order to respectively each this target gray value be multiply by this gain, these a plurality of object pixels in this target picture produce a plurality of new gray-scale values; And
One setting module in order to this target control voltage being set at this control voltage of this display, and is shown in this target picture on this display with these a plurality of new gray-scale values.
6, device as claimed in claim 5, wherein this display is the LCD screen of an employing back light.
7, device as claimed in claim 5, wherein this target control voltage is a direct current voltage or a width modulation square wave.
8, device as claimed in claim 5, wherein this look-up table is in order to store the many groups corresponding relation between this reference gray level value (R) and this target control voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100738957A CN100505006C (en) | 2006-04-05 | 2006-04-05 | Method and device for regulating display brightness according to image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100738957A CN100505006C (en) | 2006-04-05 | 2006-04-05 | Method and device for regulating display brightness according to image |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101051443A CN101051443A (en) | 2007-10-10 |
| CN100505006C true CN100505006C (en) | 2009-06-24 |
Family
ID=38782830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100738957A Expired - Fee Related CN100505006C (en) | 2006-04-05 | 2006-04-05 | Method and device for regulating display brightness according to image |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100505006C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527122B (en) * | 2008-03-07 | 2011-12-14 | 群康科技(深圳)有限公司 | Display device and control method thereof |
| EP2336310A1 (en) | 2009-12-16 | 2011-06-22 | Isobionics B.V. | Valencene synthase |
| CN102859578B (en) * | 2010-04-23 | 2016-02-10 | Nec显示器解决方案株式会社 | Display device, display packing |
| CN105070252B (en) * | 2015-08-13 | 2018-05-08 | 小米科技有限责任公司 | Reduce the method and device of display brightness |
| CN106157897B (en) | 2016-09-26 | 2018-11-20 | 京东方科技集团股份有限公司 | A kind of brightness control method, device, AMOLED panel and electronic equipment |
| CN107591141B (en) * | 2017-09-28 | 2019-12-03 | 武汉华星光电技术有限公司 | Liquid crystal display driving method, system and computer-readable medium |
| CN109032741B (en) * | 2018-07-25 | 2022-04-19 | 努比亚技术有限公司 | Terminal screen brightness adjusting method, mobile terminal and storage medium |
| CN109274949A (en) * | 2018-10-30 | 2019-01-25 | 京东方科技集团股份有限公司 | A kind of method of video image processing and its device, display equipment |
| WO2020211020A1 (en) * | 2019-04-17 | 2020-10-22 | Shenzhen Yunyinggu Technology Co., Ltd. | Method and system for determining grayscale mapping correlation in display panel |
| CN110706659B (en) * | 2019-10-23 | 2021-04-09 | 厦门天马微电子有限公司 | Display compensation method, display and display device |
| CN113450700B (en) * | 2020-07-10 | 2022-07-22 | 重庆康佳光电技术研究院有限公司 | Display control method and device, display equipment and electronic equipment |
| CN113099200B (en) * | 2021-06-10 | 2021-09-03 | 深圳市火乐科技发展有限公司 | Method, apparatus, storage medium, and electronic device for processing video signal |
-
2006
- 2006-04-05 CN CNB2006100738957A patent/CN100505006C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101051443A (en) | 2007-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100505006C (en) | Method and device for regulating display brightness according to image | |
| JP4668342B2 (en) | Liquid crystal display device | |
| US8576157B2 (en) | Low-power image display device and method | |
| US8421361B2 (en) | Backlight control circuit and method thereof | |
| US8054286B2 (en) | Liquid crystal display capable of adjusting brightness of backlight thereof and method for driving same | |
| KR100415510B1 (en) | Liquid crystal display device with a function of adaptive brightness intensifier and method for therefor | |
| US7339565B2 (en) | Method and apparatus for driving liquid crystal display device | |
| KR100810873B1 (en) | Display driving circuit | |
| EP2037442A2 (en) | Image display device and method capable of adjusting brightness | |
| US8228286B2 (en) | Display device having variable backlight and method driving the same | |
| US20180090077A1 (en) | Liquid crystal display apparatus and backlight control method thereof | |
| KR101677182B1 (en) | Method of dimming backlight assembly | |
| CN105185353A (en) | Liquid crystal display brightness control method and device, and liquid crystal display equipment | |
| EP2194524B1 (en) | Display device and brightness controlling method therefor | |
| KR101502686B1 (en) | Display device with backlight dimming compensation | |
| US11004404B2 (en) | Image data processing apparatus and display device for reducing power consumption of backlight | |
| US20100309213A1 (en) | Adaptive Stepping-Control System and Method for Dynamic Backlight Control | |
| US7719550B2 (en) | Method and apparatus for adjusting luminosity of monitor based on image | |
| US8508559B2 (en) | Method of driving a light source, method of displaying an image using the same, and display apparatus for performing the same | |
| US7428647B2 (en) | System and method for managing information handling system display response time | |
| JP2010085807A (en) | Display device | |
| TWI384450B (en) | Image displaying method, device, and related liquid crystal display panel | |
| CN102859578A (en) | Display device, display method and program | |
| KR101351884B1 (en) | Liquid crystal display device and driving method thereof | |
| KR20110047656A (en) | Liquid Crystal Display Device And Method Of Driving The Same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090624 Termination date: 20210405 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |