CN1564068A - Method and device for regulating backlight brightness - Google Patents
Method and device for regulating backlight brightness Download PDFInfo
- Publication number
- CN1564068A CN1564068A CN 200410035345 CN200410035345A CN1564068A CN 1564068 A CN1564068 A CN 1564068A CN 200410035345 CN200410035345 CN 200410035345 CN 200410035345 A CN200410035345 A CN 200410035345A CN 1564068 A CN1564068 A CN 1564068A
- Authority
- CN
- China
- Prior art keywords
- frame
- load
- picture load
- light unit
- back light
- 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.)
- Granted
Links
Images
Abstract
The device includes buffer, counter and comparator. Buffer receives and stores vision data of frame. Counter receives the vision data of the frame as well as image load of first frame. The comparator is coupled to the counter in order to compare image load of first frame with known image load. Control signal indicated compared result is output to backlight unit to tune brightness of the backlight unit.
Description
Technical field
The present invention relates to a kind of adjustment backlight illumination method and device, particularly be used in display.The present invention is a picture load of utilizing detected image, and learns the light and shade characteristic of image, and then adjusts the brightness of the back light unit of display.
Background technology
Along with semiconductor manufacturing and flat-panel screens development of technology, known to LCD (LiquidCrystal Display, display device such as LCD), can be applicable to various electronic product, for example mobile phone (Cellular Telephone), digital camera (Digital Camera) and personal digital assistant (Personal Digital Assistant, information products such as PDA), or even flight instrument display system has all adopted the LCD technology.The product of this class can use in the environment of different bright-dark degrees usually, and in order to allow the image that is presented on the lcd screen have better visibility, LCD needs one (backlight) backlight source, just is positioned at the light source of LCD back side of panel.Yet the size of LCD is increasing at present, and the lumen that causes being produced will form strong light face, so can cause the discomfort of human eye.
In known technology, be to utilize external sensor testing environment light quantity, and then adjust brightness backlight, make the shown brightness of extraneous light quantity and LCD panel reach balance.When extraneous light quantity is big, provides lower brightness to the LCD panel, and when extraneous light quantity is less, provide higher brightness to the LCD panel.Yet, when extraneous light quantity is bigger, and during the gray-scale value of the shown picture of LCD lower (dark),, cause picture dark more, then can't the judge rightly content of picture of user if provide lower brightness to LCD.
In addition, the pupil of human eye can amplify along with the light in the external world or dwindle, and when extraneous light quantity was big, pupil can dwindle automatically; Otherwise when extraneous bright hour, pupil can amplify automatically.Therefore, when the user watched picture, if the shown picture of LCD panel is when switching to brighter picture by darker picture, pupil had little time reaction, and made human eye uncomfortable even damage.
Summary of the invention
In view of this, in order to address the above problem, fundamental purpose of the present invention is to provide a kind of adjustment backlight illumination method and device, is applicable to display.The present invention is a picture load of utilizing detected image, and learns the light and shade characteristic of image, and then adjusts the brightness of the back light unit of display.When avoiding the user to watch picture, the human eye discomfort that bright moment conversion is produced to picture.
For obtaining above-mentioned purpose, the present invention proposes a kind of adjustment backlight illumination method, is applicable to display.The video data of the image of desire demonstration at first is provided, and obtains the picture load of this image according to the video data of this image.Then, compare this picture load and set picture load, and according to the brightness of comparative result with the adjustment back light unit.If this picture load greater than the known image load, when the panel of display shows this image, reduces the brightness of back light unit simultaneously.
For obtaining above-mentioned purpose, the present invention more proposes a kind of adjustment backlight illumination device, is applicable to display.This device comprises impact damper, counter and comparer.Impact damper receives and stores the video data of frame.Counter receives the video data of this frame, and obtains the picture load of first frame.And comparer couples counter, be in order to relatively picture load and the known image load of first frame, and output is in order to indicate the back light unit that controls signal to of comparative result, to adjust the brightness of this back light unit.
Description of drawings:
Fig. 1 represents the adjustment backlight illumination method flow diagram of the embodiment of the invention.
Fig. 2 represents to be applicable to the adjustment backlight illumination device of the adjustment backlight illumination method of embodiment.
Fig. 3 is presentation video histogram (Image Histogram).
Fig. 4 represents the picture load of the embodiment of the invention and the graph of a relation of backlight illumination.
Fig. 5 represents the adjustment backlight illumination method flow diagram of another embodiment of the present invention.
Fig. 6 represents to be applicable to the adjustment backlight illumination device of the adjustment backlight illumination method of another embodiment.
The picture load of video data and the graph of a relation of backlight illumination before and after Fig. 7 represents in another embodiment of the present invention.
Symbol description:
1,2～adjustment backlight illumination device; 10～impact damper; 11～counter; 12 comparers; 13～panel; 14～back light unit; 15～buffer.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Fig. 1 is the adjustment backlight illumination method flow diagram of the expression embodiment of the invention, and the method is applicable to the back light unit of display.The video data (step S10) of the image of desire demonstration at first is provided, and obtains the picture load (Image Loading) (step S11) of this image.Then, compare this picture load and set picture load (step S12), and according to the brightness (for example, lighting tube brightness in back light unit) of comparative result with the adjustment back light unit.If this picture load greater than set picture load, when the panel of display shows this image, reduces the brightness (step S13) of back light unit simultaneously.
Fig. 2 is the adjustment backlight illumination device 1 that expression is applicable to the adjustment backlight illumination method of embodiment, wherein adjusts backlight illumination device 1 and is applicable to display.Adjust backlight illumination device 1 and comprise impact damper 10, counter 11 and comparer 12.The video data of the image that desire shows in a frame is VD10.Video data VD10 is sent to impact damper 10 and counter 11, impact damper 10 temporary video data VD10.Simultaneously, counter 11 according to video data VD10 to calculate the picture load of this image.
Fig. 3 is presentation video histogram (Image Histogram), and this histogram is indicated in an image, the number of times that each gray-scale value (0～255) occurs.This image histogram can provide the characteristic of this image, as bright-dark degree.Picture load is exactly to utilize the relation of gray-scale value and its occurrence number and get.Following equation can calculate the picture load value of each image.
a＝∑N×G (1.1)
Wherein, the picture load value of a representative image, N represents the inferior number of pixels that shows each gray-scale value in this image, and G represents each gray-scale value.
When counter 11 according to video data VD10 with after calculating picture load, picture load IL10 is sent to comparer 12.Comparer 12 compares picture load IL10 and set picture load, and output control signal C10 is to back light unit 14, to adjust the brightness of back light unit 14.If when picture load IL10 value greater than set picture load value, during to panel 13, control signal C10 exports back light unit 14 at impact damper 10 output video data VD10, with the brightness of control reduction back light unit 14.
Fig. 4 represents the picture load IL10 of the embodiment of the invention and the graph of a relation of brightness, and il represents set picture load value, and il10 representative image load IL10 value.As shown in the figure, when il10 less than il, brightness maintains default brightness; And work as the il10 value greater than il, brightness reduces.
Fig. 5 is the adjustment backlight illumination method flow diagram of expression another embodiment of the present invention, and the method is applicable to the back light unit of display, and this back light unit has default brightness.The video data (step S20) of the image of desire demonstration is provided, and obtains the picture load (step S21) of this image.The then relatively picture load of this image and the picture load (step S22) of previous image, wherein the picture load of this last image is to be stored in advance in the buffer, and according to the brightness (step S23) of comparative result with the adjustment back light unit.If the picture load of this image when panel shows this image, reduces the brightness (step S24) of this back light unit greater than the picture load of previous image and above a limit value.Then, after a given time was kept in the brightness of the back light unit after reducing, the luminance recovery of back light unit was default brightness (step S25).In addition, obtain the picture load (step S21) of this image after, the picture load (step S26) of temporary this image.In addition, if the picture load of this image is not more than the picture load of previous image, the fluorescent tube of back light unit is kept default brightness.
Fig. 6 is the adjustment backlight illumination device 2 that expression is applicable to the adjustment backlight illumination method of another embodiment, wherein adjusts backlight illumination device 2 and is applicable to display.This embodiment comprises impact damper 10, counter 11, comparer 12 and buffer 15.The video data of the image that desire shows in a frame is VDn.At this moment, buffer 15 is picture load ILn-1 of temporary previous image.The picture load of this embodiment also is to be got by aforesaid equation (1.1).Similarly, video data VDn is sent to impact damper 10 and counter 11.The temporary video data VDn of impact damper 10, simultaneously, counter 11 according to video data VDn to calculate the picture load of this image.
When counter 11 according to video data VDn with the picture load that calculates this image after, the picture load ILn of this image is sent to comparer 12.At this moment, it is temporary that picture load ILn also is sent to buffer 15, and former temporary picture load ILn-1 is sent to comparer 12.Comparer 12 compares picture load ILn and picture load ILn-1, and output control signal C20 is to back light unit 14, to adjust the brightness of back light unit 14.When the difference of picture load ILn value and picture load ILn-1 value greater than a limit value, at first, during to panel 13, control signal C20 exports back light unit 14 to, to reduce the brightness of back light unit 14 in impact damper 10 output video data VDn.Afterwards, after lower brightness maintained a given time, the luminance recovery of back light unit 14 was default brightness.
Being temporarily stored in the picture load ILn of buffer 15, is when showing next image when desire, with the picture load ILn+1 of next image relatively, and then adjust the brightness of back light unit 14.
Fig. 7 be in expression another embodiment of the present invention before and after the graph of a relation of brightness of the picture load of video data and back light unit 14.Wherein, two video data values was poor before and after ild represented, ili represents limit value.As ild during less than ILi, the brightness of back light unit 14 maintains default brightness; And the ild value is greater than ili, and the brightness of back light unit 14 reduces.And T1 behind given time, the luminance recovery of back light unit 14 is default brightness.
The present invention is to utilize picture load to judge the light and shade of desiring picture displayed.When showing bright picture, back light unit provides lower brightness, unlikelyly allows the user when bright, dark picture moment conversion, causes the discomfort of human eye.In addition, treat people's adaptation of eye after, the brightness that recovers back light unit allows the user more can view and admire the picture of preferable correlative value after adapting to light quantity.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (10)
1. adjust the backlight illumination method for one kind, be applicable to a display, this display has a plate and a back light unit, comprises the following steps:
The video data of one first frame is provided;
According to the video data of this first frame, obtain a picture load of this first frame; And
The relatively picture load of this first frame and a known image load, and according to comparative result to adjust the brightness of this back light unit.
2. adjustment backlight illumination method as claimed in claim 1, wherein, in the step of the picture load of this first frame relatively and this known image load, when the picture load of this first frame greater than this known image load, when panel shows this first frame, reduce the brightness of this back light unit.
3. adjustment backlight illumination method as claimed in claim 2, wherein, after a given time was kept in the brightness of this lower back light unit, the luminance recovery of this back light unit was a default brightness.
4. adjustment backlight illumination method as claimed in claim 1, wherein, in obtaining the step of this picture load, the picture load of this first frame is to get it by equation a=∑ N * G, and a represents the picture load of this first frame, and N represents the inferior number of pixels that shows each gray-scale value in this first frame, represents each gray-scale value, wherein, N and G are included in the video data of this first frame.
5. adjustment backlight illumination method as claimed in claim 1, wherein, this known image load is the picture load of one second frame, and this second frame is the last person of this first frame.
6. adjustment backlight illumination method as claimed in claim 5 more comprises the following steps:
Temporary this known image load; And
After obtaining the picture load of this first frame, with this temporary known image load of picture load covering of this first frame.
7. adjust the backlight illumination device for one kind, be applicable to a display, this display has a plate and a back light unit, comprising:
One impact damper is in order to receive and to store the video data of one first frame;
One counter in order to receiving the video data of this first frame, and is obtained the picture load of this first frame; And
One comparer couples this counter, in order to the relatively picture load and a known image load of this first frame, and exports in order to indicate one of comparative result to control signal to this back light unit, to adjust the brightness of this back light unit.
8. adjustment backlight illumination device as claimed in claim 7, wherein, when the picture load of this first frame greater than this set picture load, the video data of exporting this first frame at this impact damper is during to this panel, this control signal exports this back light unit to, to reduce the brightness of this back light unit.
9. as the 7th described adjustment backlight illumination device of claim, wherein, the picture load of this frame is to get it by equation a=∑ N * G, and a represents the picture load of this frame, N represents the inferior number of pixels that shows each gray-scale value in this frame, G represents each gray-scale value, and wherein, N and G are contained in the video data of this frame.
10. adjustment backlight illumination device as claimed in claim 7, wherein, this known image load is the picture load of one second frame, and this second frame is the last person of this first frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100353457A CN100507666C (en) | 2004-04-22 | 2004-04-22 | Method and device for regulating backlight brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100353457A CN100507666C (en) | 2004-04-22 | 2004-04-22 | Method and device for regulating backlight brightness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1564068A true CN1564068A (en) | 2005-01-12 |
| CN100507666C CN100507666C (en) | 2009-07-01 |
Family
ID=34481567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100353457A Active CN100507666C (en) | 2004-04-22 | 2004-04-22 | Method and device for regulating backlight brightness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100507666C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353232C (en) * | 2005-03-10 | 2007-12-05 | 友达光电股份有限公司 | Back light module |
| US7540643B2 (en) | 2005-02-17 | 2009-06-02 | Au Optronics Corp. | Backlight modules |
| CN101364384B (en) * | 2007-08-06 | 2010-05-26 | 深圳Tcl工业研究院有限公司 | Method and apparatus for liquid crystal image processing |
| CN101325035B (en) * | 2007-06-15 | 2011-06-08 | 深圳Tcl工业研究院有限公司 | Method for processing liquid crystal image |
| CN101675376B (en) * | 2007-04-30 | 2011-12-28 | 惠普开发有限公司 | Methods and systems for adjusting backlight luminance |
| CN101465099B (en) * | 2007-12-19 | 2012-05-30 | 康佳集团股份有限公司 | LCD TV backlight drive circuit and method |
| CN102568396A (en) * | 2007-03-26 | 2012-07-11 | 日本电气株式会社 | Mobile phone terminal and corresponding method thereof |
| CN101167119B (en) * | 2005-04-30 | 2012-11-14 | 奥斯兰姆奥普托半导体有限责任公司 | Light source arrangement for backlighting display apparatuses and display apparatus |
| CN104464687A (en) * | 2014-10-30 | 2015-03-25 | 广东欧珀移动通信有限公司 | Method and device for adjusting backlight value of mobile terminal |
| CN116939255A (en) * | 2023-09-15 | 2023-10-24 | 苏州华兴源创科技股份有限公司 | Video image display method, device and storage medium |
-
2004
- 2004-04-22 CN CNB2004100353457A patent/CN100507666C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7540643B2 (en) | 2005-02-17 | 2009-06-02 | Au Optronics Corp. | Backlight modules |
| CN100353232C (en) * | 2005-03-10 | 2007-12-05 | 友达光电股份有限公司 | Back light module |
| CN101167119B (en) * | 2005-04-30 | 2012-11-14 | 奥斯兰姆奥普托半导体有限责任公司 | Light source arrangement for backlighting display apparatuses and display apparatus |
| CN102568396A (en) * | 2007-03-26 | 2012-07-11 | 日本电气株式会社 | Mobile phone terminal and corresponding method thereof |
| CN101675376B (en) * | 2007-04-30 | 2011-12-28 | 惠普开发有限公司 | Methods and systems for adjusting backlight luminance |
| CN101325035B (en) * | 2007-06-15 | 2011-06-08 | 深圳Tcl工业研究院有限公司 | Method for processing liquid crystal image |
| CN101364384B (en) * | 2007-08-06 | 2010-05-26 | 深圳Tcl工业研究院有限公司 | Method and apparatus for liquid crystal image processing |
| CN101465099B (en) * | 2007-12-19 | 2012-05-30 | 康佳集团股份有限公司 | LCD TV backlight drive circuit and method |
| CN104464687A (en) * | 2014-10-30 | 2015-03-25 | 广东欧珀移动通信有限公司 | Method and device for adjusting backlight value of mobile terminal |
| CN104464687B (en) * | 2014-10-30 | 2016-11-30 | 广东欧珀移动通信有限公司 | The backlight value method of adjustment of a kind of mobile terminal and device |
| CN116939255A (en) * | 2023-09-15 | 2023-10-24 | 苏州华兴源创科技股份有限公司 | Video image display method, device and storage medium |
| CN116939255B (en) * | 2023-09-15 | 2023-12-01 | 苏州华兴源创科技股份有限公司 | Video image display method, device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100507666C (en) | 2009-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2161708A2 (en) | Dynamic backlight adaptation | |
| JP5566019B2 (en) | Liquid crystal display device and driving method thereof | |
| US8654060B2 (en) | Processing device and processing method of high dynamic contrast for liquid crystal display apparatus | |
| US8154506B2 (en) | Device and method for adjusting backlight brightness | |
| US7916153B1 (en) | Backlight dimming and LCD amplitude boost | |
| TWI280784B (en) | Image processor, image processing method, and image processing program | |
| US20040246242A1 (en) | Display apparatus, image display system, and terminal using the same | |
| CN101042841A (en) | Lighteness adjusting apparatus and method thereof | |
| TWI406213B (en) | Backlight controller, display device using the same and method for controlling backlight module | |
| TWI362642B (en) | Adaptive gamma voltage switching method and device using the same | |
| CN101826282A (en) | Liquid crystal display device and processing method of digital image signal | |
| CN1564068A (en) | Method and device for regulating backlight brightness | |
| TW200842795A (en) | Apparatus and method for contrast control | |
| US20080231585A1 (en) | Display apparatus of dynamic image and display method thereof | |
| US8519942B2 (en) | Display device and backlight brightness control method thereof | |
| CN101075412A (en) | Dynamic contrast enhancing method and part for liquid-crystal display device | |
| CN100433126C (en) | Display device and method capable of reinforcing image comparison | |
| CN115966187A (en) | Brightness compensation method, display panel and storage medium | |
| KR100866872B1 (en) | Apparatus and method for controling light screen of projection display system | |
| CN114495842A (en) | Liquid crystal display device based on Mini LED backlight source and local dimming and driving method | |
| CN117079608A (en) | Display control method, display control device, electronic equipment and readable storage medium | |
| CN1932944A (en) | Passive luminous display terminal image brightness control method |
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 |