CN101777310B - Dynamic backlight control method - Google Patents
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Abstract
The invention relates to a light-emitting control method for adopting and controlling liquid crystals to emit light from independent light sources for displaying characters, in particular to a dynamic backlight control method for an LED display panel. The control method comprises the following steps: setting at least one control point between two preset fixed threshold values of the average brightness of the full screen, and forming a regulation curve corresponding to backlight brightness between the control point and each of the two fixed threshold values to be used as a reference for backlight regulation; computing the weighted average of the previously computed average brightness value and the subsequently computed average brightness value to acquire the average brightness value of the full screen of the current frame image; and correspondingly regulating the backlight brightness according to the backlight brightness value corresponding to the average brightness value on the regulation curve used as the reference for backlight regulation. Thus, the invention provides a method for dynamically regulating backlight brightness, which overcomes the defect of light leakage of the inherent dark gray scale in liquid crystal display and structure coordination, increases the dynamic contrast, improves the image quality, and realizes the purposes of energy saving and environmental protection.
Description
Technical field
The present invention relates to a kind of liquid crystal that adopts and also control, be specifically related to a kind of dynamic backlight control method of LED display panel from the luminous light-emitting control method that is used for character display of arbitrary source.
Background technology
Liquid crystal panel in present widely used LCD is not luminous, but relies on the light source that provides backlight behind the liquid crystal panel, thereby accomplishes Presentation Function.At present in liquid crystal panel, using more backlight is LED, and LED is as Backlight For Liquid Crystal Display Panels, its color reducibility number, and brightness uniformity is good, and the life-span is long, and anti-seismic performance is good, has been applied in the back lighting device of liquid crystal panel.But in the existing design, in order to improve display quality, overcome itself intrinsic defective, people expect effectively controlling backlight according to the variation of backlighting parameters, for example
Publication number is CN101656049, and the Chinese invention patent that name is called " backlight luminance control apparatus and method thereof " discloses a kind of backlight luminance control apparatus and method thereof.Backlight luminance control apparatus comprises control mode determination module and brightness regulation module; The control mode determination module is used for obtaining according to the input signal that receives the display brightness parameter of display panels; And according to said display brightness parameter acquisition control signal; The brightness regulation module is connected with the control mode determination module, is used for adjusting with the brightness of pulse width modulation mode adjustment backlight or with the pulse-amplitude modulation mode according to said control signal the brightness of backlight.The present invention is through the combination of pulse width modulation mode and pulse-amplitude modulation mode; When display brightness is higher; Brightness with pulse width modulation mode adjustment backlight; When display brightness is low, adjust the brightness of backlight with the pulse-amplitude modulation mode, effectively overcome the scintillation of using the LED-backlit source to exist.
Publication number comprises backlight for the Chinese invention patent that the CN101159121 name is called " back-light source control system and method " discloses a kind of back-light source control system; Two-dimensional optical measuring unit is used to gather the luminance parameter of backlight, generates the brightness distribution data of backlight; Signal processing unit is used for obtaining brightness distribution data from two-dimensional optical measuring unit, and brightness distribution data is handled, and generates the control signal of control back light source brightness, and sends to backlight.The invention also discloses a kind of backlight control method, comprise the luminance parameter of gathering backlight; Generate the brightness distribution data of backlight according to luminance parameter; Generate the control signal of control back light source brightness according to brightness distribution data; Drive current according to control signal output control back light source brightness.Through system and method provided by the invention, realized the raising of backlight homogeneity, thereby improved display quality, and solved the otherness that light emitting diode self exists in the backlight.
Publication number is CN101441856, the name be called " backlight module and control brightness of backlight module method " Chinese invention patent disclose a kind of backlight module and control brightness of backlight module method.Said backlight module comprises a plurality of light emitting sources, an OPTICAL SENSORS and a control circuit.But each light emitting source independent operation of said a plurality of light emitting sources.The brightness that said OPTICAL SENSORS is used for detecting said a plurality of light emitting sources is to produce a luminance signal.Said control circuit is used for driving said a plurality of light emitting source according to said luminance signal.When said backlight module was used for one scan formula LCD backlight, said control circuit cut out the part light emitting source of said a plurality of light emitting sources according to a shows signal.When said a plurality of light emitting sources were all opened, said control circuit read said luminance signal, to adjust said brightness of backlight module according to said luminance signal.
Publication number is CN101630484, and the Chinese invention patent that name is called " backlight controller, use its display device and the control method of backlight module " discloses a kind of backlight controller, used its display device and the method for control backlight module.Backlight controller comprises temporal weighting module and dimming controlling module.Temporal weighting module calculate provide to the weight of first backlight illumination of present picture and target backlight luminance with, to adjust backlight illumination as one.Wherein, target backlight luminance for according to present picture presentation content obtained.Dimming controlling module is according to target backlight luminance, and will adjust backlight illumination increases or reduce a step value, and generation provides second backlight illumination to next picture.By this, the backlight illumination of backlight module can be fast and is adjusted to target backlight luminance reposefully, and avoiding the flicker of backlight, and the backlight illumination of backlight module can be with the adjustment of presentation content adaptive ground to reduce power consumption.
Publication number is CN1658110, and the Chinese invention patent that name is called " control method of back light source brightness and control device " discloses a kind of control method of back light source brightness, is applicable to notebook computer.The present invention at first image backlight exported of retrieving images control die set regulates power save signal; See through light in addition again and detect the brightness that module detects external environment; With illuminance value arround obtaining, again according to arround the illuminance value try to achieve the peripheral brightness sensing agreement signal of corresponding external environment brightness.Control back light source brightness according to image adjusting power save signal backlight and peripheral brightness sensing agreement signal then, make notebook computer promote less electricity consumption.
With above-mentioned patented technology is that the prior art of representative provides and utilizes backlight illumination to several different methods of controlling backlight and corresponding device thereof; But since they based on purpose have nothing in common with each other; Though they have all had certain improvement to the display quality of display panels; But their disclosed control methods are also insufficient, and are limited to the display effect that improves LCD.
Therefore, the present invention just is based on above-mentioned prior art, in order to overcome dull gray rank light leak problem intrinsic in liquid crystal display and the respective outer side edges; Improve dynamic contrast; Improve image quality, and realize the purpose of energy-conserving and environment-protective, and a kind of method of dynamic adjustment backlight illumination is provided.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of backlight control method; Through adjustment to full frame backlight illumination, overcome dull gray rank light leak problem intrinsic in liquid crystal display and the respective outer side edges, improved dynamic contrast; Improve image quality, and realized the purpose of energy-conserving and environment-protective.
In order to realize above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of dynamic backlight control method, this control method comprises:
(1) two in preset full frame mean flow rate fixedly are provided with at least one reference mark between the threshold values, this reference mark with said two fixedly between the threshold values corresponding backlight illumination form the benchmark of first curve as adjustment backlight;
(2) brightness of full frame middle each pixel of current frame image in the scanning display screen, first average brightness value full frame according to the scanning result weighted average calculation;
(3) brightness of full frame middle each pixel of current frame image in the threshold values of the fixed interval scanning display screen, second average brightness value full frame according to the scanning result weighted average calculation,
(4) obtain the full frame average brightness value of current frame image according to twice average brightness value weighted mean in front and back of calculating in above-mentioned two steps;
(5) basis is at the adjustment backlight illumination as the corresponding backlight brightness values correspondence of the above average brightness value of first curve of adjustment benchmark backlight.
In addition, in described step (1), fixedly also be provided with second curve that has identical reference mark but distinguish corresponding different backlight illuminations between the threshold values, can adjust backlight illumination according to described second curve through selection to liquid crystal display modes at two.The backlight illumination of corresponding higher limit is the 70%-75% of the backlight illumination of the corresponding higher limit of described first curve in described second curve.Make the entire backlight luminance regulating method can be implemented in the equal purpose that can improve display quality and save the energy under the different mode
In the step of above-mentioned control method two fixedly threshold values be divided into higher limit and lower limit; Higher limit＞lower limit wherein; Between this higher limit and lower limit, only be provided with a reference mark; In above-mentioned final step, described average brightness value and this higher limit, reference mark and lower limit are compared respectively, said backlight illumination is adjusted according to comparative result.Control method can be explained as follows more specifically; The corresponding backlight illumination of the higher limit of described fixedly threshold values and lower limit is respectively first brightness and second brightness, and the corresponding backlight illumination in described reference mark is the 3rd brightness, wherein first brightness＞the 3rd brightness＞second brightness; Then
(1) when higher limit≤average brightness value, controls full frame backlight illumination and be the first preset brightness;
(2) when higher limit＞average brightness value＞reference mark, control full frame backlight illumination and between first preset brightness and the 3rd brightness, adjust;
(3) when reference mark＞average brightness value＞lower limit, control full frame backlight illumination and between the 3rd preset brightness and second brightness, adjust;
(4) when lower limit >=average brightness value, control full frame backlight illumination and be the second preset brightness.
Said backlight illumination is in preset fixed value first brightness and the 3rd brightness, the corresponding linear adjustment that is directly proportional respectively with described average brightness value between the 3rd brightness and second brightness.
And the dutycycle of backlight illumination through control PWN signal to be reaching gradual change control backlight in the specific time, and this control can prevent because the unexpected variation of brightness and observer's vision is caused adverse influence.As for the variation of PWN signal dutyfactor control,, here do not given unnecessary details owing to be known to backlight illumination yet.
The another kind of mode of comparatively saving system resource and accelerating computing velocity is with said full frame at least two the different brightness zones that are divided into; Each luminance area is a described average brightness value in the basic calculation one's respective area according to the pixel value in the one's respective area; And calculate full frame average brightness value according to the average brightness value that calculates in the zones of different more respectively, and control the change of brightness in the one's respective area respectively according to the whole-screen brightness value.
The zone that utilizes above-mentioned method to divide display screen can full framely be divided into the identical regular domain of shape or said luminance area is the variform regular domain to said full frame division.The quantity of the pixel in the preferred described different luminance areas should be identical simultaneously, and the brightness in the zones of different detects carries out synchronous detection through same detecting unit
Adopt above-mentioned technical scheme,, overcome dull gray rank light leak problem intrinsic in liquid crystal display and the respective outer side edges, improved dynamic contrast, improved image quality, and realize the purpose of energy-conserving and environment-protective through adjustment to full frame backlight illumination.
Description of drawings
What show among Fig. 1 is the process flow diagram that utilizes method for controlling backlight thereof of the present invention;
Trident backlight control curve synoptic diagram in the prior art that shows among Fig. 2;
What show among Fig. 3 is the synoptic diagram of backlight control curve under two kinds of patterns of the present invention.
Embodiment
The invention reside in the method that a kind of dynamic adjustment backlight illumination is provided; Through adjustment to full frame backlight illumination, overcome dull gray rank light leak problem intrinsic in liquid crystal display and the respective outer side edges, improved dynamic contrast; Improve image quality, and realized the purpose of energy-conserving and environment-protective.
What show among Fig. 1 is the process flow diagram that utilizes method for controlling backlight thereof of the present invention.To improve the liquid crystal display problem in order being implemented in to satisfy under normal mode and the energy saver mode in the LCD in the present embodiment, to prevent the liquid crystal display light leak.Two kinds of patterns in this embodiment of the present invention, have been adopted; Corresponding different adjustment curve in every kind of pattern; Backlight illumination in every kind of curve and full frame average brightness value corresponding relationship and inconsistent, physical relationship can the part after instructions further specify.On the whole; All be preset with two of full frame mean flow rate fixedly threshold values Max on the corresponding different curves of above-mentioned two kinds of patterns; Min; And between them, be provided with at least one reference mark Con, at this reference mark Con and said two fixing threshold values Max, corresponding respectively backlight illumination constitutes first curve C 1 and second curve C 2 between the Min.Wherein first curve C 1 corresponds to the adjustment relation of the backlight illumination that is applied under the normal mode and full frame mean flow rate; And second curve C 2 corresponds to the adjustment relation of the backlight illumination that is applied under the energy saver mode and full frame mean flow rate; Above-mentioned two curve C 1, C2 is as the benchmark of different mode adjustment relation down.
Utilize the brightness of full frame each pixel of current frame image in the detecting unit scanning display screen then; The first average brightness value A1 full frame according to the scanning result weighted average calculation; The computing method here adopt whole pixel brightness to add the result who obtains divided by the pixel value sum afterwards entirely, and the scanning of sum of all pixels is comprehensively confirmed according to the result to display field scan and line scanning; The brightness of each pixel of current frame image in the threshold values scanning display screen of fixed interval is then carried out the second full frame average brightness value A2 of weighted average calculation according to scanning result and with identical method to data.According to the twice average brightness value A1 in front and back that calculates in above-mentioned two steps, the A2 weighted mean obtains the full frame average brightness value A of current frame image, and the current frame image here is exactly the image when the fixed interval time, detected the second time of acquisition afterwards.
And full frame brightness calculation method is not limited to full frame mean flow rate overall calculation, also can be that full frame being divided into is at least two different brightness zones, each luminance area is the described average brightness value of basic calculation according to the pixel value in the one's respective area.Need to prove; To above-mentioned whole-screen brightness dividing region can identical regular domain or the said luminance area of shape be the variform regular domain to said full frame division; In addition; The quantity of the pixel in the different luminance areas is preferably identical, and the brightness in the zones of different detects carries out synchronous detection through same detecting unit, and the average sample value that in according to zones of different, calculates calculates full frame sample value.
At last can according to before the pattern selected confirm different adjustment bases, i.e. brightness through the corresponding adjustment backlight of backlight illumination corresponding on first curve C 1 or second curve C 2 with the average brightness value A that obtains.The liquid crystal display displays effect can either be adjusted to reach, purpose of energy saving can be realized again.
What show among Fig. 2 is Trident backlight control curve synoptic diagram in the prior art; Relation between its full frame mean flow rate that has realized backlight illumination is controlled (Lu1 shown in transverse axis among the figure) and the backlight illumination (Lu2 shown in the longitudinal axis in scheming) is mainly used in the difference of comparative descriptions control method of the present invention.This method mainly shows as two fixing linear change between Lu1 and the Lu2 between the threshold values.Though can realize reducing the purpose of power consumption according to the adjustment of this relation, not can solve the purpose of adjustment image comparison relation.The embodiment that Fig. 3 shows just is based on the improvement that proposes on the basis of this existing curve, explanation specific as follows.
What show among Fig. 3 is the synoptic diagram of backlight control curve under two kinds of patterns of the present invention.The transverse axis Lu1 of coordinate system is full frame mean flow rate among the figure; Longitudinal axis Lu2 is a backlight illumination; The fixedly threshold values Max of two full frame mean flow rates of correspondence that all are provided with on two curves in this coordinate system; Min is divided into upper limit value M ax and lower limit Min, and wherein upper limit value M ax＞lower limit Min is provided with a reference mark Con between upper limit value M ax on two curves in the present embodiment and the lower limit Min; And adjustment relation confirm compare definitely on curve afterwards respectively according to average brightness value A and this upper limit value M ax, reference mark Con and lower limit Min, according to comparative result said backlight illumination is adjusted at last.
Concrete comparative approach is more directly perceived; Comprise that at first the upper limit value M ax and the corresponding backlight illumination of lower limit Min of said fixing threshold values are respectively the first brightness P1 and the second brightness P2; The backlight illumination that described reference mark Con is corresponding is the 3rd brightness P3; The first brightness P1＞the 3rd brightness P3＞second brightness P2 wherein, then
(1) when upper limit value M ax≤average brightness value A, controls full frame backlight illumination and be the first preset brightness P1;
(2) when upper limit value M ax＞average brightness value A＞reference mark Con, control full frame backlight illumination and between first preset brightness P1 and the 3rd brightness P3, adjust;
(3) when reference mark Con＞average brightness value A＞lower limit Min, control full frame backlight illumination and between the 3rd preset brightness P3 and the second brightness P2, adjust;
(4) when lower limit Min >=average brightness value A, control full frame backlight illumination and be the second preset brightness P2.
If it is a plurality of that certain reference mark between upper limit value M ax and lower limit Min is provided with, then above-mentioned comparative approach is expanded the comparison that adds correspondence in proper order and just can be used.In addition, backlight illumination is at preset fixed value first brightness P1 and the 3rd brightness P3, the corresponding linear adjustment that is directly proportional respectively with described average brightness value A between the 3rd brightness P3 and the second brightness P2.
With data declaration, on first curve C 1 and second curve C 2, chosen three points respectively more specifically, controlled when the average brightness value of full-screen image is chosen Min=16IRE, Con=46IRE, Max=80IRE respectively.If still backlight illumination is adjusted to minimum value under the situation of the average brightness value of full-screen image greater than 16IRE; Blur effect can appear in the pictures many in dark scene; So when having only mean flow rate when full-screen image, backlight illumination is adjusted into minimum value less than 16IRE; Simultaneously because normal pictures reaches the situation of 80IRE and few,, improve the contrast of picture so brightness of image transfers to maximal value with backlight illumination during greater than 80IRE; In addition at 16IRE with choosing 46IRE as the reference mark in the middle of the 80IRE, backlight illumination is transferred to 80%, being that benchmark all can strengthen picture brightness based on two curves.In the present embodiment, first curve C 1 and second curve C 2 adopt identical reference mark Con reconnaissance method, and wherein to control to be 75% of first curve C 1 to second curve C, 2 corresponding maximum backlight illuminations, thereby satisfy requirements of saving energy.Like this, according to above-mentioned method of adjustment backlight illumination being adjusted display afterwards accordingly has better contrast and satisfies requirements of saving energy.
At last; The dutycycle of the pwm signal that the control liquid crystal display is backlight reaches backlight to liquid crystal display with this; Take the mode of gradual change in the process of adjusting backlight; The variation of guaranteeing PWN dutycycle in the whole adjustment process should be adopted the mode that progressively changes, and reaches the purpose of gradual change control, prevents to change suddenly and visual discomfort that human eye is caused should.Certainly, this dutycycle control to liquid crystal display PWN signal backlight should be controlled according to the variation of above-mentioned whole-screen brightness mean value.If to the full frame zones of different of having divided, also can control the PWN signal dutyfactor of corresponding region change is controlled variation backlight in the zones of different.
Like this,, overcome dull gray rank light leak problem intrinsic in liquid crystal display and the respective outer side edges, improved dynamic contrast, improved image quality, and realized the purpose of energy-conserving and environment-protective through adopting of the adjustment of above-mentioned technical scheme to full frame backlight illumination.
In addition, protection scope of the present invention is not limited to disclosed specific embodiment in the above-mentioned embodiment, as long as but the combination of satisfying technical characterictic in the claim of the present invention just fallen within protection scope of the present invention.
Claims (10)
1. a dynamic backlight control method is characterized in that, this control method comprises:
(1) at two of preset full frame mean flow rate fixing threshold values (Max; Min) be provided with at least one reference mark (Con) between; At this reference mark (Con) with said two fixedly threshold values (Max, Min) between corresponding backlight illumination form the benchmark of first curve (C1) as adjustment backlight;
(2) brightness of full frame middle each pixel of current frame image in the scanning display screen, first average brightness value (A1) full frame according to the scanning result weighted average calculation;
(3) brightness of full frame middle each pixel of current frame image in the time valve scan value display screen of fixed interval, second average brightness value (A2) full frame according to the scanning result weighted average calculation;
(4) according to twice average brightness value in front and back that calculates in above-mentioned two steps (A1, A2) weighted mean obtains the full frame average brightness value of current frame image (A);
(5) basis is at the adjustment backlight illumination as the corresponding backlight brightness values correspondence of the full frame average brightness value of the above current frame image of first curve (C1) (A) of adjustment benchmark backlight.
2. a kind of dynamic backlight control method according to claim 1; It is characterized in that; Described two fixing threshold values (Max; Min) be divided into higher limit (Max) and lower limit (Min), wherein higher limit (Max)＞lower limit (Min) only is provided with a reference mark (Con) between this higher limit (Max) and lower limit (Min); In above-mentioned final step, the full frame average brightness value of described current frame image (A) and this higher limit (Max), reference mark (Con) and lower limit (Min) are compared respectively, said backlight illumination is adjusted according to comparative result.
3. a kind of dynamic backlight control method according to claim 2; It is characterized in that; The corresponding backlight illumination of described higher limit (Max) and lower limit (Min) is respectively first brightness (P1) and second brightness (P2), and the backlight illumination that described reference mark (Con) is corresponding is the 3rd brightness (P3), wherein first brightness (P1)＞the 3rd brightness (P3)＞second brightness (P2); Then
When higher limit (the Max)≤full frame average brightness value of described current frame image (A), control full frame backlight illumination and be preset first brightness (P1);
When higher limit (Max)＞full frame average brightness value of described current frame image (A)＞reference mark (Con), control the adjustment between preset first brightness (P1) and the 3rd brightness (P3) of full frame backlight illumination;
When the full frame average brightness value of reference mark (Con)＞described current frame image (A)＞lower limit (Min), control the adjustment between preset the 3rd brightness (P3) and second brightness (P2) of full frame backlight illumination;
When lower limit (the Min) >=full frame average brightness value of described current frame image (A), control full frame backlight illumination and be preset second brightness (P2).
4. a kind of dynamic backlight control method according to claim 3; It is characterized in that; Said backlight illumination is in preset fixed value first brightness (P1) and the 3rd brightness (P3), the corresponding linear adjustment that is directly proportional respectively with the full frame average brightness value of described current frame image (A) between the 3rd brightness (P3) and second brightness (P2).
5. according to claim 1,2,3 or 4 described a kind of dynamic backlight control methods, it is characterized in that described backlight illumination is controlled gradual change backlight in the specific time, to reach through the dutycycle of control PWN signal.
6. a kind of dynamic backlight control method according to claim 1; It is characterized in that; Said full frame at least two the different brightness zones that are divided into; Each luminance area is average brightness value and an average sample value in the basic calculation one's respective area according to the pixel value in the one's respective area, and calculates full frame average sample value according to the average sample value that calculates in the zones of different more respectively, controls the change of brightness in the one's respective area respectively according to full frame average sample value.
7. a kind of dynamic backlight control method according to claim 6 is characterized in that, described luminance area is for being the variform regular domain to said full frame division to the said full frame identical regular domain of shape or the said luminance area of being divided into.
8. a kind of dynamic backlight control method according to claim 7 is characterized in that, the quantity of the pixel in the described different luminance areas is identical, and the brightness in the zones of different detects carries out synchronous detection through same detecting unit.
9. a kind of dynamic backlight control method according to claim 1; It is characterized in that; In described step (1) at said two fixing threshold values (Max; Min) also be provided with second curve (C2) that has identical reference mark (Con) but distinguish corresponding different backlight illuminations between, can adjust backlight illumination according to described second curve (C2) through selection to liquid crystal display modes.
10. a kind of dynamic backlight control method according to claim 9 is characterized in that, the backlight illumination of corresponding higher limit (Max) is the 70%-75% of the backlight illumination of the corresponding higher limit of described first curve (C1) (Max) in described second curve (C2).
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| CN101360182B (en) * | 2007-07-31 | 2010-07-21 | 深圳Tcl工业研究院有限公司 | Video image processing method |
| WO2009096329A1 (en) * | 2008-01-30 | 2009-08-06 | Sharp Kabushiki Kaisha | Video display device |
| JP2010002876A (en) * | 2008-05-19 | 2010-01-07 | Sony Ericsson Mobilecommunications Japan Inc | Display device, display control method, and display control program |
-
2010
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| CN101777310A (en) | 2010-07-14 |
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