CN101888726A - Adaptive stepping-control system and method of dynamic backlight control - Google Patents
Adaptive stepping-control system and method of dynamic backlight control Download PDFInfo
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- CN101888726A CN101888726A CN2009101429013A CN200910142901A CN101888726A CN 101888726 A CN101888726 A CN 101888726A CN 2009101429013 A CN2009101429013 A CN 2009101429013A CN 200910142901 A CN200910142901 A CN 200910142901A CN 101888726 A CN101888726 A CN 101888726A
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- backlight
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to adaptive stepping-control system and method of dynamic backlight control (DBLC). A stepping-control unit regulates the output of a backlight control device to ensure that illumination of backlight generated by the backlight unit is slowly changed, wherein the illumination change amount (i.e. stepping rate) of the backlight in per unit time is changed according to the content of image data.
Description
Technical field
The present invention relates to a kind of dynamic backlight control, particularly relate to adaptability stepping control (adaptive stepping-control) system and method for a kind of dynamic backlight control.
Background technology
(backlight) backlight be in order to from the back side or the side illuminate a kind of technology of flat-panel screens (for example LCD).Light source can be cold-cathode tube (CCFL), light-emitting diode (LED) or other light sources.
Fixed (constant backlight) backlight is no matter how image data or marginal ray change the light that held stationary all can be provided.One of fixed shortcoming backlight is to have light leak (light leakage) phenomenon when rank (" 0 ") are deceived in demonstration, thereby cause bad dynamic contrast characteristic.
In order to increase its contrast, must use dynamic backlight (dynamic backlight, DBL) technology, its dynamically or adaptively (adaptively) according to the distribution scenario of image data or marginal ray to adjust the backlight illumination of integral body or specific part.For example, when showing bright image, meeting output high brightness backlight; When show shadow as the time, then weaken output brightness backlight, thereby can reduce light leak.By this, dynamic backlight is than the fixed higher dynamic contrast that has backlight.Moreover with fixed in comparison backlight, dynamic backlight can also reduce the consumption of power.
Yet, when the luminance difference of adjacent image news frames (hereinafter to be referred as " news frame ") is very big (for example, the news frame of 10% brightness is being followed the news frame of one 90% brightness), can not change output illumination backlight suddenly, otherwise the onlooker can feel flicker.For fear of this problem, need change output illumination backlight in gentle mode.Fig. 1 shows a kind of conventional art of gentle change backlight illumination.In graphic, illumination backlight changes to object illumination value (V+4) from former brightness value (V) gradually with step-by-step system (stepwise).As shown in the figure, backlight illumination is not to become object illumination value (V+4) suddenly from former brightness value (V), but increases some backlight illuminations in each time.Specifically, increase the backlight illumination of a unit in the per unit time.In other words, in the conventional practice shown in Figure 1, its illumination change has fixing step rate (stepping rate), or is called dimming ratio (dimming rate).
The effect of above-mentioned conventional art in some is used still can be accepted, and for example (for example, is shown in the figure user interface (GUI) of computer monitor) when adjacent news frame has similar brightness.Yet, when the luminance difference of adjacent news frame is very big, for example animation or film, the effect that this kind conventional art is produced is not good.For example, when backlight illumination just increases with rising stepping shown in Figure 1, if become dark news frame from bright news frame this moment suddenly, then backlight illumination will change immediately with the decline stepping, thereby cause the object illumination value (V+4) of last news frame can't reach at all.
This shows that traditional backlight control can't be caught up with the change of image, obviously still has inconvenience and defective, and demands urgently further being improved.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product and method do not have appropriate structure and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of effective mechanism, in order to the step rate (or dimming ratio) of Adaptive Control backlight illumination, make backlight not only can easing up change its illumination, also can catch up with the change of image fast, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, propose a kind of adaptability stepping control that is used for dynamic backlight,, be very suitable for practicality in order to reach gentle demonstration and good contrastive feature.
The object of the invention to solve the technical problems realizes by the following technical solutions.Adaptability stepping control (adaptivestepping-control) system according to a kind of dynamic backlight of the present invention's proposition is controlled comprises: a dynamic backlight control device, in order to dynamic adjustment backlight illumination; And a stepping control unit, in order to adjusting the output of this backlight control apparatus, the backlight illumination that makes a back light unit the be produced change of being eased up; Wherein, the backlight illumination change amount of time per unit is that content according to image data changes.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The adaptability step-by-step control system of aforesaid dynamic backlight control, wherein above-mentioned back light unit is controlled by this stepping control unit, changes illumination with step-by-step system (stepwise).
The adaptability step-by-step control system of aforesaid dynamic backlight control, wherein above-mentioned stepping control unit produces pulse-width modulation (PWM) signal, and its work period (duty) is proportional with this backlight illumination.
The adaptability step-by-step control system of aforesaid dynamic backlight control, it more comprises a content change rate estimating device, and its reception and analyze the content of this image data is to estimate the content change rate of this image data.
The adaptability step-by-step control system of aforesaid dynamic backlight control, wherein above-mentioned content are the mean flow rate of image news frame.
The object of the invention to solve the technical problems also realizes by the following technical solutions.Adaptability stepping control (adaptivestepping-control) method of a kind of dynamic backlight control that proposes according to the present invention comprises: according to image data to produce backlight control signal; And adjust this backlight control signal, the backlight illumination that makes a back light unit the be produced change of being eased up;
Wherein, the backlight illumination change amount of time per unit changes according to the content of this image data.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The adaptability stepper control method of aforesaid dynamic backlight control, wherein above-mentioned back light unit is controlled by this adjusted backlight control signal, changes illumination with step-by-step system (stepwise).
The adaptability stepper control method of aforesaid dynamic backlight control, wherein above-mentioned adjusted backlight control signal is pulse-width modulation (PWM) signal, its work period (duty) is proportional with this backlight illumination.
The adaptability stepper control method of aforesaid dynamic backlight control, wherein above-mentioned adjusted backlight control signal is pulse-width modulation (PWM) signal, its work period (duty) is proportional with this backlight illumination.
The adaptability stepper control method of aforesaid dynamic backlight control, wherein above-mentioned content are the mean flow rate of image news frame.
By technique scheme, the adaptability step-by-step control system and the method for dynamic backlight control of the present invention have following advantage and beneficial effect at least: the present invention's stepping control backlight can change adaptively according to the content change rate of interrogating frame.By this, the news frame can show and not tool flicker gentlely, in addition, backlightly also can react to object illumination apace, thereby be obtained good dynamic contrast.
The data data in sum, the adaptability stepping of a kind of dynamic backlight of the present invention control (DBLC) control (adaptive stepping-control) system and method.The stepping control unit is adjusted the output of backlight control apparatus, makes the change of being eased up of backlight illumination that back light unit produced.Wherein, the backlight illumination change amount of time per unit (that is, step rate) be to do to change according to the content of image data.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 shows a kind of conventional art schematic diagram of gentle change backlight illumination.
Fig. 2 shows the adaptability step rate control system and the method schematic diagram of the dynamic backlight control (DBLC) of the embodiment of the invention.
Fig. 3 illustration one is the news frame sequence of content changing and the corresponding backlight illumination schematic diagram of stepping control period at a slow speed.
The news frame sequence of Fig. 4 illustration one quick content changing and the corresponding backlight illumination schematic diagram of stepping control period.
200: adaptability step rate control system and method
20: dynamic backlight control (DBLC) device 22: stepping control unit
24: back light unit 26: content change rate estimating device
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, adaptability step-by-step control system and its embodiment of method, structure, method, step, feature and the effect thereof of the dynamic backlight control that foundation the present invention is proposed, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to get one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Fig. 2 shows dynamic backlight control (dynamic backlight control, DBLC) adaptability step rate (or dimming ratio) control system and the method 200 of the embodiment of the invention.In the present embodiment, dynamic backlight control (DBLC) device 20 dynamically according to the distribution scenario of image data to adjust the backlight illumination of integral body or specific part.For example, when showing bright image, meeting output high brightness backlight; When show shadow as the time, then weaken output brightness backlight.In other embodiments, dynamic backlight control (DBLC) device 20 dynamically according to marginal ray to adjust the backlight illumination of integral body or specific part.
The output of dynamic backlight control (DBLC) device 20 by stepping control unit 22 to provide control signal to back light unit (BLU) 24.In one embodiment, so that pulse-width modulation (PWM) signal to be provided, its work period (duty) is proportional with backlight illumination by stepping control unit 22 for dynamic backlight control (DBLC) device 20.Stepping control unit 22 (it can be a circuit) is in order to adjust the output of dynamic backlight control (DBLC) device 20, to make back light unit (BLU) 24 backlight illuminations that produced to change in gentle mode.In the present embodiment, change into the object illumination value with step-by-step system (stepwise) from former brightness value in the illumination of back light unit (BLU) 24, but not directly become the object illumination value from former brightness value suddenly, thereby can improve the problem of flicker.
In the present embodiment, the backlight illumination change amount (or step pitch) of per unit time is that content according to image data changes.In other words, step rate (or dimming ratio) in general is not to be fixed value.The variable step rate that inputs to stepping control unit 22 is to be decided by content change rate estimation (content change-rate estimation) device 26, and its reception is also analyzed the content change rate of image data with the estimation image data.
Fig. 3 illustration one is the news frame sequence of content changing and the corresponding backlight illumination of stepping control period at a slow speed.As shown in the figure, the mean flow rate of bright news frame F1 to F3 corresponds to 90% backlight illumination respectively.Next, the mean flow rate of secretly interrogating frame F4 to F11 corresponds to 10% backlight illumination respectively.According to graphic, because the quantity very big (for example greater than a preset value) of dark news frame F4 to F11, therefore, content change rate estimating device 26 judges that news frame sequence F1 to F11 are content changing at a slow speed.Therefore, content change rate estimating device 26 promptly provides less illumination step rate (for example-10%) to give back light unit (BLU) 24.In other words, the 24 per unit times of back light unit (BLU) can reduce by 10% illumination.
The news frame sequence of Fig. 4 illustration one quick content changing and the corresponding backlight illumination of stepping control period.As shown in the figure, the mean flow rate of bright news frame F1 to F2 corresponds to 90% backlight illumination respectively.Next, the mean flow rate of secretly interrogating frame F3 to F4 corresponds to 10% backlight illumination respectively.Moreover the mean flow rate of bright news frame F5 to F6 corresponds to 90% backlight illumination respectively.At last, secretly interrogating frame F7 follows after F6.According to graphic, because the quantity very little (for example less than a preset value) of dark news frame F3 to F4, therefore, content change rate estimating device 26 judges that news frame sequence was quick content changing before F4.Therefore, content change rate estimating device 26 promptly provides bigger illumination step rate (for example-40%) to give back light unit (BLU) 24.In other words, the 24 per unit times of back light unit (BLU) can reduce by 40% illumination.Then, image changes bright news frame F5-F6 into from dark news frame F3-F4 again.Because the quantity very little (for example less than a preset value) of bright news frame F5 to F6, therefore, content change rate estimating device 26 judges that news frame sequence also is quick content changing after F5.Therefore, content change rate estimating device 26 promptly provides bigger illumination step rate (for example+40%) to give back light unit (BLU) 24.In other words, the 24 per unit times of back light unit (BLU) can increase by 40% illumination.
According to the foregoing description, stepping control backlight can change adaptively according to the content change rate of interrogating frame.By this, the news frame can show and not tool flicker gentlely, in addition, backlightly also can react to object illumination apace, thereby be obtained good dynamic contrast.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. the adaptability step-by-step control system of dynamic backlight control is characterized in that it comprises:
One dynamic backlight control device is in order to dynamic adjustment backlight illumination; And
One stepping control unit, in order to adjusting the output of this backlight control apparatus, the backlight illumination that makes a back light unit the be produced change of being eased up;
Wherein, the backlight illumination change amount of time per unit is that content according to image data changes.
2. the adaptability step-by-step control system of dynamic backlight control according to claim 1 is characterized in that wherein above-mentioned back light unit is controlled by this stepping control unit, changes illumination with step-by-step system.
3. the adaptability step-by-step control system of dynamic backlight control according to claim 1 is characterized in that wherein above-mentioned stepping control unit produces the pulse-width modulation signal, and its work period and this backlight illumination are proportional.
4. the adaptability step-by-step control system of dynamic backlight according to claim 1 control is characterized in that it more comprises a content change rate estimating device, and its reception and analyze the content of this image data is to estimate the content change rate of this image data.
5. the adaptability step-by-step control system of dynamic backlight control according to claim 4 is characterized in that wherein above-mentioned content is the mean flow rate of image news frame.
6. the adaptability stepper control method of dynamic backlight control is characterized in that it comprises:
According to image data to produce backlight control signal; And
Adjust this backlight control signal, the backlight illumination that makes a back light unit the be produced change of being eased up;
Wherein, the backlight illumination change amount of time per unit changes according to the content of this image data.
7. the adaptability stepper control method of dynamic backlight control according to claim 6 is characterized in that wherein above-mentioned back light unit is controlled by this adjusted backlight control signal, changes illumination with step-by-step system.
8. the adaptability stepper control method of dynamic backlight control according to claim 6 is characterized in that wherein above-mentioned adjusted backlight control signal is the pulse-width modulation signal, and its work period and this backlight illumination are proportional.
9. the adaptability stepper control method of dynamic backlight control according to claim 6 is characterized in that it more comprises a step, in order to receive and to analyze the content of this image data, to estimate the content change rate of this image data.
10. the adaptability stepper control method of dynamic backlight control according to claim 6 is characterized in that wherein above-mentioned content is the mean flow rate of image news frame.
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| CN2009101429013A CN101888726A (en) | 2009-05-13 | 2009-05-13 | Adaptive stepping-control system and method of dynamic backlight control |
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| CN2009101429013A CN101888726A (en) | 2009-05-13 | 2009-05-13 | Adaptive stepping-control system and method of dynamic backlight control |
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Cited By (1)
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Application publication date: 20101117 |