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CN102157140A - Backlight control device and control method thereof - Google Patents

Backlight control device and control method thereof Download PDF

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Publication number
CN102157140A
CN102157140A CN2010101163065A CN201010116306A CN102157140A CN 102157140 A CN102157140 A CN 102157140A CN 2010101163065 A CN2010101163065 A CN 2010101163065A CN 201010116306 A CN201010116306 A CN 201010116306A CN 102157140 A CN102157140 A CN 102157140A
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frame information
backlight
mode
brightness
picture frame
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CN2010101163065A
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Inventor
李重建
李宗原
林清淳
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Priority to CN2010101163065A priority Critical patent/CN102157140A/en
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明提供一种背光控制装置及其控制方法，该背光控制装置用以控制背光板的亮度，包括影像分析器以及模式切换器。影像分析器接收目前像框信息以及先前像框信息，比较并获得目前像框信息以及先前像框信息的变化量。模式切换器接收变化量并依据变化量来设定用以调整背光板的亮度的显示模式。

Figure 201010116306

The present invention provides a backlight control device and a control method thereof. The backlight control device is used to control the brightness of a backlight panel, and includes an image analyzer and a mode switcher. The image analyzer receives current image frame information and previous image frame information, compares and obtains the change amount of the current image frame information and the previous image frame information. The mode switcher receives the change amount and sets a display mode for adjusting the brightness of the backlight panel according to the change amount.

Figure 201010116306

Description

Backlight control apparatus and control method thereof
Technical field
The invention relates to a kind of backlight control apparatus and method, and particularly relevant for a kind of control device and method of backlight of display panel.
Background technology
In the luminous display device of passive type (for example liquid crystal indicator), providing backlight to be used as light emitting source is a kind of known technology of behaving most.And at the display quality of display device because user's demand and when constantly promoting, the simple light source that provides not only just is provided backlight.Backlight brightness is also adjusted in response to the consumption of different display conditions and electric power, so that the usefulness of display device can effectively rise.
(Content Adaptive Back-light Control, CABC) technology is a kind of technology that a kind of content of utilizing show image is adjusted the brightness of backlight to the context adaptive backlight control.This context adaptive backlight control technology is based on display device under the pattern that shows tableaux or dynamic menu, comes the corresponding brightness of adjusting backlight.With so reach under the power consumption of full blast, make display device present best display effect.Yet, in existing context adaptive backlight control technology, in the switching of backlight brightness, Chang Yinwei switching time incorrect, and make the shown picture of display device produce the phenomenon of flicker and reduce display quality.
Summary of the invention
The invention provides a kind of backlight control apparatus and control method thereof, carry out static state or animation display, and adjust the brightness of backlight according to this in order to automatic detection display panel.
The present invention proposes a kind of backlight control apparatus, and the brightness in order to the control backlight comprises image analyzer and mode switch.Image analyzer receives present frame information and previous frame information, relatively and obtain present frame information and previous frame change in information amount.Mode switch couples image analyzer, in order to receive variable quantity and to set display mode in order to the brightness of adjusting backlight according to variable quantity.
In an embodiment of the present invention, above-mentioned image analyzer obtains variable quantity according to the difference of the GTG value of a plurality of pixels of corresponding identical display position in frame information at present and the previous frame information.
In an embodiment of the present invention, above-mentioned mode switch is variable quantity and setting value relatively, and when variable quantity during greater than setting value, the mode switch setting display mode is an animation mode, when variable quantity was not more than setting value, the mode switch setting display mode was a static schema.
In an embodiment of the present invention, when above-mentioned display mode was animation mode, the brightness correspondence of backlight was turned down.And when display mode was static schema, the brightness correspondence of backlight was raised.
In an embodiment of the present invention, above-mentioned backlight control apparatus more comprises storer.Storer couples image analyzer, in order to receive and to store previous frame information.
The present invention proposes a kind of method for controlling backlight thereof in addition, in order to the brightness of control backlight, comprising: receive present frame information and previous frame information, relatively and obtain present frame information and previous frame change in information amount.And, set display mode in order to the brightness of adjusting backlight according to variable quantity.
Based on above-mentioned, the present invention is according to present frame information that will show and the previous frame change in information amount that shows before, learn two differences between frame information, and then learn that display is to carry out the animation or the display mode of tableaux demonstration, and adjust the brightness of backlight according to display mode.Thus, the scintillation that can effectively avoid display to be produced when display mode switches improves the quality that shows.
For the above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate institute's accompanying drawing to be described in detail below.
Description of drawings
Fig. 1 is the synoptic diagram of the backlight control apparatus 100 of one embodiment of the invention;
Fig. 2 is the synoptic diagram of the variable quantity account form of the embodiment of the invention;
Fig. 3 is the process flow diagram of the method for controlling backlight thereof of one embodiment of the invention.
Description of reference numerals
100: backlight control apparatus; 110: export/go into the interface;
121: the control working storage; 122: storer;
130: image analyzer; 140: mode switch;
150: image processor; 160: display panel;
170: adjuster backlight; 180: backlight;
190: host side; 210,220: frame information;
S310～S350: the step of method for controlling backlight thereof; DATA: information;
MODE: display mode; P1～Pm, P1 '～Pm ': GTG value.
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of the backlight control apparatus 100 of one embodiment of the invention.Backlight control apparatus 100 is used for controlling the brightness of backlight 180, comprises exporting/go into interface 110, controls working storage 121, storer 122, image analyzer 130, mode switch 140, image processor 150 and adjuster backlight 170.Wherein, export/go into interface 110 receptions and come from host side (host) the 190 information D ATA that transmitted, and this information D ATA is sent to respectively in control working storage 121 and the storer 122.At this, the information D ATA that host side 190 is transmitted generally includes the order data that the image of display panel video data and 100 actions of control backlight control apparatus are provided.The part of image video data then is sent to storer 122 and stores, and order data then is sent to control working storage 121 and keeps in.
In addition, the value that exporting/go into interface 110 also provides host side 190 will control storage in working storage 121 or the storer 122 is read, and this knows the known technology of the knowledgeable usually for this area tool, does not give unnecessary details for this reason at this.
Image analyzer 130 is coupled to control working storage 121 and storer 122.Image analyzer 130 receives present frame information and previous frame information is handled.Wherein, when the memory capacity of storer 122 is enough big, previous frame information and frame information can be by depositing in the storer 122 successively at present.Image analyzer 130 reads previous frame information by storer 122 again and present frame information is handled.Also or when the memory capacity of storer 122 hour, storer 122 only need store previous frame information and get final product.And when transmitting present frame information when host side 190, image analyzer 130 is read previous frame information by storer 122 again and is handled with the present frame information that reaches immediately and get final product.
Image analyzer 130 compares at previous frame information and present frame information, judges two continuous frame change in information amounts.Wherein, image analyzer 130 can subtract each other with the present corresponding GTG value that is shown to a plurality of pixels of same position in the display panel 160 of frame information at previous frame information, to obtain a plurality of GTG differences.Below please synchronously with reference to Fig. 2, Fig. 2 is the synoptic diagram of the variable quantity account form of the embodiment of the invention.In the illustrating of Fig. 2, the GTG value of the pixel in the previous frame information 210 was respectively P1～Pm, and the GTG value of the pixel of frame information then is respectively P1 '～Pm ' at present.Image analyzer 130 calculates the difference of difference, GTG value P2 and the P2 ' of GTG value P1 and P1 ' respectively ... GTG value Pn and Pn ' GTG value ... the difference of Pm and Pm ' obtains m GTG difference, and (m wherein, n are positive integer, m＞n).Variable quantity then can comprise these a plurality of GTG differences, also can be the summation of a plurality of GTG differences.In addition, P1～Pm can be respectively the GTG value of single pixel, or is respectively the mean value of interior these a plurality of pixel gray level values of block of pixels of a plurality of pixels compositions.
Also or image analyzer 130 can set up previous frame information and present all gray scale histograms (histogram) of the pixel of frame information, and compare at two gray scale histograms, whether calculate the gray scale histogram of previous frame information and the variable quantity of the gray scale histogram of present frame information, it is excessive with present frame change in information to judge previous frame information by this.
Please again with reference to Fig. 1, mode switch 140 is coupled to image analyzer 130 and receives the variable quantity that image analyzer 130 is produced.Mode switch 140 compares at variable quantity and setting value, uses to judge that the image that shows to display panel 160 is provided is static image or dynamic image.In simple terms, when variable quantity is the summation of all GTG difference, only need come comparison at variable quantity and setting value.When variable quantity during greater than setting value, the image that display panel 160 will show is a dynamic image, and when variable quantity was not more than setting value, the image that display panel 160 will show was a static image.When if variable quantity comprises a plurality of GTG difference, 140 of mode switch compare respectively at each GTG difference and setting value that each is fixed, mode switch 140 is judged greater than the ratio that setting value accounts for all GTG differences according to all GTG differences again, the image that display panel 160 will show is static image or dynamic image, just the GTG difference ratio that accounts for all GTG differences greater than setting value is a dynamic image during greater than one, is static image when ratio is not more than aritical ratio.
Note that above-mentioned aritical ratio and setting value can be set according to thumb rule or experimental data by design engineer or user, details does not describe in detail for this reason.
Mode switch 140 after the foundation changing value is judged image that display panel 160 will show and is static image or dynamic image, the then corresponding display mode MODE that sets the brightness of adjusting backlight 180.Judging the image that display panel 160 will show when mode switch 140 is static image, display mode MODE is set to static schema, opposite, judging the image that display panel 160 will show when mode switch 140 is dynamic image, and display mode MODE is set to animation mode.
Mode switch 140 also transmits display mode MODE to adjuster 170 backlight.Adjuster 170 backlight and the corresponding brightness of adjusting backlight 180 according to display mode MODE.Wherein, adjuster 170 backlight is when display mode MODE is animation mode, and correspondence is turned down the brightness of backlight 180 to save power supply.And adjuster 170 backlight is when display mode MODE is static schema, and correspondence heightens the brightness of backlight 180 so that display frame is more clear.
Please pay special attention to backlight control apparatus 100 detection of dynamic display panels 160 images to display, and the brightness of when display panel 160 display frames have bigger the variation, switching backlight 180.Thus, the brightness change action of backlight 180 is difficult for being discovered by the user, effectively lowers the situation of film flicker.
Subsidiary one what carry is that adjuster backlight 170 is same accepts to come from the control signal of controlling working storage 121.It is with being intended to provide the user to adjust the interface of control backlight 180 brightness by host side 190.Also therefore, when the brightness that adjuster 170 backlight carries out backlight 180 at foundation display mode MODE was adjusted, the brightness of the backlight 180 that can set by host side 190 according to above-mentioned user was that benchmark is adjusted.For instance, when display mode MODE is static schema, backlight 180 brightness that the brightness of the backlight of setting with the user 180 is.And when display mode MODE be animation mould when showing, then the brightness of the backlight of setting with the user 180 be multiply by one less than 1 proportional numers (as 80%), adjusts backlight 180 brightness.
Below please refer to Fig. 3, Fig. 3 is the process flow diagram of the method for controlling backlight thereof of one embodiment of the invention.At first, with previous frame information storage (step S310) in storer, and the previous frame information that receives in present frame information and the storer compares to obtain two variable quantities (step S320) between frame information.At this, frame information also can be stored in the storer earlier at present, and when carrying out the comparison of present frame information and previous frame information, is taken out by storer again.Also or at present frame information need not be stored in the storer and directly provides and compared by the previous frame information of being taken out in the storer.
After obtaining variable quantity, then judge the relation (step S330) of variable quantity V and setting value S, wherein, then carry out the switching (step S350) of display mode as variable quantity V during greater than setting value S.Opposite, if when judging variable quantity V and being not more than setting value S, then do not carry out the switching of display mode and reply execution in step S310.In addition, host side can also be sent and require to carry out the switching of display mode, so the switching that whether requires to carry out display mode at host side among the step S340 is judged.If host side requires to carry out the switching of display mode, execution in step S330 and find out previous frame information and the bigger time point of frame information change amount at present then, and carry out the switching of display mode.Switching requirement with the display mode of reaching host side.
In sum, when the present invention utilized the shown image variable quantity of display panel big, the brightness of carrying out backlight was switched.Effectively reduce because the phenomenon of the display frame flicker of being derived is switched in backlight brightness.When taking into account the saving power consumption, more effective lifting display quality.
Though the present invention describes as above with embodiment; yet it is not in order to limit the present invention, to have in any affiliated technical field and know the knowledgeable usually, not break away from the spirit and scope of the invention; all can do a little and change and retouching, so protection scope of the present invention is when being as the criterion with claims.

Claims (10)

1.一种背光控制装置，用以控制一背光板的亮度，包括：1. A backlight control device, used to control the brightness of a backlight panel, comprising: 一影像分析器，接收一目前像框信息以及一先前像框信息，比较并获得该目前像框信息以及该先前像框信息的一变化量；以及，An image analyzer, receiving a current picture frame information and a previous picture frame information, comparing and obtaining a variation of the current picture frame information and the previous picture frame information; and, 一模式切换器，耦接该影像分析器，接收该变化量并依据该变化量来设定用以调整该背光板的亮度的一显示模式。A mode switcher, coupled to the image analyzer, receives the variation and sets a display mode for adjusting the brightness of the backlight panel according to the variation. 2.根据权利要求1所述背光控制装置，其中该影像分析器依据该目前像框信息与该先前像框信息中对应相同显示位置的多数个像素的灰阶值的差来获得该变化量。2. The backlight control device according to claim 1, wherein the image analyzer obtains the change amount according to the difference between the grayscale values of the plurality of pixels corresponding to the same display position in the current picture frame information and the previous picture frame information. 3.根据权利要求1所述背光控制装置，其中该模式切换器比较该变化量与一设定值，当该变化量大于该设定值时，该模式切换器设定该显示模式为一动画模式，当该变化量不大于该设定值时，该模式切换器设定该显示模式为一静态模式。3. The backlight control device according to claim 1, wherein the mode switcher compares the change amount with a set value, and when the change amount is greater than the set value, the mode switcher sets the display mode as an animation mode, when the change amount is not greater than the set value, the mode switcher sets the display mode as a static mode. 4.根据权利要求3所述背光控制装置，其中当该显示模式为该动画模式时，该背光板的亮度对应被调低，而当该显示模式为该静态模式时，该背光板的亮度对应被调高。4. The backlight control device according to claim 3, wherein when the display mode is the animation mode, the brightness of the backlight panel is correspondingly lowered, and when the display mode is the static mode, the brightness of the backlight panel is correspondingly lowered. was turned up. 5.根据权利要求1所述背光控制装置，其中还包括：5. The backlight control device according to claim 1, further comprising: 一存储器，耦接该影像分析器，用以接收并储存该先前像框信息。A memory, coupled to the image analyzer, is used to receive and store the previous picture frame information. 6.一种背光控制方法，用以控制一背光板的亮度，包括：6. A backlight control method, used to control the brightness of a backlight panel, comprising: 接收一目前像框信息以及一先前像框信息，比较并获得该目前像框信息以及该先前像框信息的一变化量；以及，receiving a current picture frame information and a previous picture frame information, comparing and obtaining a variation of the current picture frame information and the previous picture frame information; and, 依据该变化量来设定用以调整该背光板的亮度的一显示模式。A display mode for adjusting the brightness of the backlight is set according to the variation. 7.根据权利要求6所述背光控制方法，其中所述比较并获得该目前像框信息以及该先前像框信息的该变化量的步骤包括：7. The backlight control method according to claim 6, wherein the step of comparing and obtaining the variation of the current picture frame information and the previous picture frame information comprises: 依据该目前像框信息与该先前像框信息中对应相同显示位置的多数个像素的灰阶值的差来获得该变化量。The amount of change is obtained according to the difference between the grayscale values of the plurality of pixels corresponding to the same display position in the current picture frame information and the previous picture frame information. 8.根据权利要求6所述背光控制方法，其中所述依据该变化量来设定用以调整该背光板的亮度的该显示模式的步骤包括：8. The backlight control method according to claim 6, wherein said step of setting the display mode for adjusting the brightness of the backlight panel according to the amount of change comprises: 比较该变化量与一设定值；comparing the variation with a set value; 当该变化量大于该设定值时，设定该显示模式为一动画模式；以及，When the amount of change is greater than the set value, set the display mode to be an animation mode; and, 当该变化量不大于该设定值时，设定该显示模式为一静态模式。When the variation is not greater than the set value, the display mode is set as a static mode. 9.根据权利要求8所述背光控制方法，其中当该显示模式为该动画模式时，该背光板的亮度对应被调低，而当该显示模式为该静态模式时，该背光板的亮度对应被调高。9. The backlight control method according to claim 8, wherein when the display mode is the animation mode, the brightness of the backlight panel is correspondingly lowered, and when the display mode is the static mode, the brightness of the backlight panel is correspondingly lowered. was turned up. 10.根据权利要求6所述背光控制方法，其中还包括：10. The backlight control method according to claim 6, further comprising: 储存该先前像框信息至一存储器中。The previous frame information is stored in a memory.
CN2010101163065A 2010-02-11 2010-02-11 Backlight control device and control method thereof Pending CN102157140A (en)

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Cited By (5)

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CN102355536A (en) * 2011-09-26 2012-02-15 惠州Tcl移动通信有限公司 Electricity saving method and system for mobile terminal display screen
CN103050108A (en) * 2012-12-17 2013-04-17 华为终端有限公司 Screen backlight dynamic adjustment method and user terminal
CN106782431A (en) * 2017-03-10 2017-05-31 广东欧珀移动通信有限公司 A kind of screen backlight brightness adjusting method, device and mobile terminal
CN110444170A (en) * 2019-08-21 2019-11-12 四川长虹电器股份有限公司 Reduce the control system and method for LCD TV backlight power
CN113870798A (en) * 2021-07-19 2021-12-31 义隆电子股份有限公司 Control method applied to display

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CN101271672A (en) * 2007-03-23 2008-09-24 奇美电子股份有限公司 Dynamic image detector for LCD device and its detection method

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CN101131505A (en) * 2006-08-21 2008-02-27 Lg.菲利浦Lcd株式会社 Liquid crystal display device and driving method thereof
CN101271672A (en) * 2007-03-23 2008-09-24 奇美电子股份有限公司 Dynamic image detector for LCD device and its detection method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102355536A (en) * 2011-09-26 2012-02-15 惠州Tcl移动通信有限公司 Electricity saving method and system for mobile terminal display screen
CN103050108A (en) * 2012-12-17 2013-04-17 华为终端有限公司 Screen backlight dynamic adjustment method and user terminal
CN103050108B (en) * 2012-12-17 2015-12-02 华为终端有限公司 A kind of screen backlight dynamic adjustment method and user terminal
CN106782431A (en) * 2017-03-10 2017-05-31 广东欧珀移动通信有限公司 A kind of screen backlight brightness adjusting method, device and mobile terminal
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CN106782431B (en) * 2017-03-10 2020-02-07 Oppo广东移动通信有限公司 Screen backlight brightness adjusting method and device and mobile terminal
CN110444170A (en) * 2019-08-21 2019-11-12 四川长虹电器股份有限公司 Reduce the control system and method for LCD TV backlight power
CN113870798A (en) * 2021-07-19 2021-12-31 义隆电子股份有限公司 Control method applied to display
CN113870798B (en) * 2021-07-19 2023-08-08 义隆电子股份有限公司 Control method applied to display

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Application publication date: 20110817