CN101681583A - Be used for the dynamic power control of indicator screen - Google Patents

Be used for the dynamic power control of indicator screen Download PDF

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Publication number
CN101681583A
CN101681583A CN200880016357A CN200880016357A CN101681583A CN 101681583 A CN101681583 A CN 101681583A CN 200880016357 A CN200880016357 A CN 200880016357A CN 200880016357 A CN200880016357 A CN 200880016357A CN 101681583 A CN101681583 A CN 101681583A
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screen
image
display system
zone
coefficient
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CN101681583B (en
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J·A·G·申克
A·M·弗朗西斯
G·伦恩
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1446Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of El Displays (AREA)

Abstract

Display system (100) comprising: screen (110), and it is configured to the screen intensity display image; And processor (120), it is configured to this screen (110) is divided into a plurality of zones, for example determines the regional luminance that each is regional by the real time content analysis of the image that shows in this zone; And, reduce this screen intensity with a coefficient when the regional luminance in one of these a plurality of zones during greater than threshold value.This threshold value is associated with the maximum rated current of extracting from the power supply (140) that drives a zone, and each zone can be driven by power supply (140) separately.Processor (120) also can be configured to: measure the virtual region brightness of a plurality of virtual regions of mobile preset distance on this screen, and reduce this screen intensity with this coefficient in the virtual region brightness of one of these a plurality of virtual regions during greater than threshold value.

Description

Be used for the dynamic power control of indicator screen
Technical field
Native system and method relate to and are used for dynamically changing dynamic power control (DPC) system and method for the brightness of indicator screen based on display being divided into a plurality of zones.
Background technology
The conventional display screen is used for to individual and microcommunity display video and computer picture.These screens are based on the technology such as cathode-ray tube (CRT), LCD and plasma, and they produce the high-definition picture that is enough to for the indoor brightness of watching.
In order to show static state and live image to a great number of people, no matter be all to adopt alternative technique in indoor setting or in outdoor the setting, this alternative technique can provide from 1.5 meters wide up to 20 meters wide and bigger screen size, its sufficient brightness is to use under bright sunlight conditions.The technology of competent this work ideally that has occurred is to use light emitting diode (LED) as the device that produces light.The LED screen just can obtain perhaps many years ago, and many LED screens are installed in all over the world the physical culture and public venue.
Using the indicator screen of LED is that relative energy installs efficiently, because its power consumption and its size and light are output into ratio.Typically, for given screen size, when showing bright image, the power consumption height, and when showing dark image, low in energy consumption.For permanent installation LED screen in the venues, to its power supply (promptly, suitable voltage and current is provided) ratings of required power supply is (for example, watt or power rating) can easily calculate according to fabricator's technical data, and based on screen required power quantity when its full normal light output shows the brightest possible image (the pure white image of filling screen).In this situation, screen extracts its most power that can extract, that is, and and peak power, and power supply must have enough ratings with the reply full power condition.
Recently the market demand that little LED screen (1.5 to 2 meters wide) occurred, the notion of little LED screen is similar to big plasma or LCD monitor, little LED screen is the complete monitor that is positioned at rack, for example it can be suspended on the wall in shopping center simply, and is used to show the various contents such as advertisement.Typically, these market segments are very responsive to price.Correspondingly, the screen that the expectation realization has price competitiveness, it can be installed by the layman, that is, ordinary consumer can be installed.The simplification of installing has reduced total cost and attractive to the consumer.
The factor relevant with cost comprises size or the ratings that the needed power supply of power demand is provided to the LED screen, thereby and with provide separately or the particular electrical line of force or the expense that provides power demand, voltage and/or electric current to be associated to the LED screen is provided.
As above-mentioned, typically, the power consumption of LED screen and the brightness of shown image are proportional.Image changes aspect brightness content, does not change to the brightest the plain white background of details (not with) from the darkest the ater background of details (with).
Because uncontrollable LED screen of screen design person or the brightness of content displayed on other screen arbitrarily, screen must be designed to handle the power consumption of worst-case,, shows white background that is.In this case, screen extracts peak power from power supply.Following factor is considered when the design and installation indicator screen:
1. when being higher than specific power demand, such as when maximum screen power (being used to show white background) surpasses 3.5kW, screen can't be powered by the typical feeding power such as conventional 230V single-phase socket.In this case, must special mains feed be installed or line of electric force is powered to screen, therefore increase installation cost.
2. the general power ratings of the power supply unit of screen inside must be enough to pay peak power.This needs huge and heavy screen power supplies unit, and does not use it at full capacity in most of times.Big screen power supplies has further increased screen cost and weight, and needs heat radiation.
3. owing to need heat radiation, the cooling power of the ventilating system of screen inside must be handled when peak power is moved continuously the heat of the increase that (, during the worst case of using) produced when designing screen display.Correspondingly, need more windy fan to ventilate, make cost, weight and noise increase explicitly.
Be clear that expectation reduces the power requirement of screen.The plain mode that reduces the peak power of LED screen extraction is that low value is arrived in the light export-restriction,, turns down brightness that is.When having realized reducing power, this exists significantly makes the dim and dry conspicuous shortcoming of all shown images.As quote in full the patent No.7 of the Nakamura that is incorporated into this, and 193,592 is described, and another mode that reduces the power of screen consumption comprises that restriction offers the electric current of screen.
Nakamura has described a kind of electroluminescence (EL) indicator screen, and wherein the drive current of the self-driven circuit of pixel origin drives.The current limit when driving circuit among the Nakamura increases in the summation of drive current.
The brightness of expecting further to reduce the power requirement of screen and not influencing the content, image or the text that are presented on the screen basically.
Summary of the invention
A purpose of native system and method is the shortcoming that overcomes conventional display.This purpose and other purpose realize that by a display system this display system comprises: screen, and it is configured to screen intensity value display image; And processor, it is configured to this screen divider is a plurality of zones, for example determines the regional luminance that each is regional by the real time content analysis of the image that shows in this zone; And, reduce this screen intensity with a coefficient when the regional luminance in one of these a plurality of zones during greater than threshold value.
This threshold value is associated with the maximum rated current of extracting from the power supply that drives a zone, and each zone can be by power drives separately.Processor also can be configured to: measure the virtual region brightness of a plurality of virtual regions of mobile predetermined number pixel on this screen, and when the virtual region brightness of one of these a plurality of virtual regions during greater than threshold value, reduce this screen intensity with this coefficient.
By detailed description provided below, other applications of this system and method will become apparent.Although should be understood that the exemplary embodiment that this describes in detail and specifically example illustrates this system and method, be only used for illustration purpose, but not be intended to limit the scope of the invention.
Description of drawings
By following description, claims and accompanying drawing, will understand these and other feature, aspect and the advantage of equipment of the present invention, system and method better, in the accompanying drawing:
Fig. 1 to 3 illustrates the screen that is divided into 8 zones according to illustrative embodiment;
Fig. 4 illustrates block diagram, and this block diagram illustrates the signal path according to the LED screen of illustrative embodiment;
Fig. 5 illustrates block diagram, and this block diagram comprises the delay element according to another illustrative embodiment;
Fig. 6 to 8 illustrates various curve maps, and this curve map demonstration is according to the effect of the DPC of another illustrative embodiment;
Fig. 9 illustrates the split screen according to another illustrative embodiment, and big bright image object moves on screen; And
Figure 10 illustrates a plurality of virtual regions according to another illustrative embodiment.
Embodiment
Following being described in to certain exemplary embodiments only is exemplary in nature, and is not intended to limit the present invention, application of the present invention or use.In the following detailed description to the embodiment of this system and method, with reference to accompanying drawing, accompanying drawing forms a part of describing, and the mode by explanation illustrates the specific embodiment that described system and method can be implemented in the accompanying drawing.These embodiment are enough at length described, so that those skilled in the art can implement presently disclosed system and method, and should be understood that and can utilize other embodiment and can carry out structure and logic changes and do not deviate from the spirit and scope of this system.
Therefore following detailed description should not understood in restrictive mode, and the scope of this system is defined by appended claims.Herein among the figure last (many) of reference number positions typically corresponding to figure number, exception be that the same components that occurs in a plurality of figure uses same reference numerals to identify.In addition, for the sake of clarity, thereby omitted the description of the detailed description of well known device, circuit and method not being obscured this system.
Native system and method are utilized dynamic power control (DPC) to reduce and limits the peak power that screen display device (such as the LED screen) is consumed, and do not influence have in the quality of the image of low brightness content.No matter when run into the image that comprises high brightness content, DPC automatically and substantially at once is decreased to brightness of image total power consumption is maintained the interior level of predetermined restriction.
Except do not influence have in and the image of low brightness content, use native system and the method for DPC to allow the screen maximum power dissipation is decreased to permission by the level (use be suitable for any other appropriate voltage level of the associated cable of appropriate power, electric current and voltage levvl) of conventional socket (such as the 230V supply socket) to the power supply of LED screen, rather than use for example special three-phase supply.That is to say, do not need special main linely connected power sup ply, reduce installation cost thus.In addition, the screen with DPC uses still less electric power and therefore ecological more friendly, and screen is inner needs littler/still less power supply unit, therefore reduces the cost and the weight of screen.The power consumption that reduces causes the heat that reduces to generate, and then causes the cooling requirement that reduces.Correspondingly, need fan still less to cool off screen, therefore further reduce the cost and the weight of screen and allow more quiet operation.
Do not influence in having according to using DPC to reduce power consumption and the native system and the method for the picture quality of low brightness content, the active area of screen (such as the LED screen) is divided into a plurality of zones.Each zone is driven by its oneself power supply unit (PSU).Be divided into dimensionally a plurality of zones with the strict coupling of screen area by importing the field, analyze the picture signal on screen to be shown in real time.In addition, such as each regional regional luminance value or white/light colored image-region, and select brightest area, for example by determining to analyze from real time content, use the whitest and/or light in the image zone of filling perhaps, determine the pixel brightness value of brightest area.
The total pixel brightness value and the predetermined threshold of maximum region brightness value or brightest area compare.Threshold value is such value, if the pixel in any one zone arrives this value, will cause extracting maximum rated current from driving this regional PSU.
If the determined regional luminance value in any one zone surpasses predetermined threshold, then processor reduces the specific objective coefficient with the output level of whole screen, this coefficient can be the power reduction coefficient of being scheduled to or calculate, thereby reduces power consumption and prevent the PSU overload.When total pixel level in highest region territory was equal to or less than threshold value, processor then made screen output level turn back to normal value.
The target reduction ratio of the maximum screen power of being brought by DPC can be determined by one or more factors.This target can be the total power consumption that reduces screen, makes that for example screen can be operated with typical single-phase socket rather than three-phase supply.Useful subsidiary acting as drives the required PSU number of screen and reduces, and brings the saving of cost and weight.Alternatively, thereby target can be to reduce power consumption to make in its scope that drops on specified quantity PSU, perhaps in the ability of the PSU of different size.
The effect of DPC is invisible usually for general viewers, and wherein when any one regional regional luminance surpassed predetermined DPC threshold value, the brightness of displayed content reduced.Consider that image comprises the situation of the bright details of zonule; This can be lower than the DPC threshold value and screen output will be at the maximum horizontal place.If image comprises the bright details that increases the zone, then screen output level will reduce gradually, and vice versa.Reduction ratio Shaoxing opera is strong, then screen output level reduce occur more early and will subtract lowly more.Use is demonstrated 0.6 power reduction coefficient according to the DPC of native system and method.
Shown in the system 100 of Fig. 1, display device such as LED screen 110 comprises processor 120, this processor 120 is configured to carry out DPC and controls LED screen 110 with display image, and changes screen intensity when any one regional brightness surpasses the threshold value that is stored in the storer 130 (storer 130 is coupled to processor 120).As is known, storer 130 for example also can be stored other data and comprise that the application software of software instruction supplies processor to carry out to carry out DPC.
Processor 120 can be configured to the active display area of screen 110 is divided into a plurality of zones, such as identical eight zones 1 to 8 of size and dimension.Each zone can be by its oneself one or more PSU power supplies, and the PSU that wherein is used for zone 1 is shown frame of broken lines 140 in Fig. 1.The number in regional size (according to pixels measuring) and/or zone can be definite by many factors, for example, and the power consumption of the per unit area of screen when full normal light is exported; Owing to combine the reduction ratio of the desired maximum screen power of DPC, for example 0.6 reduction ratio; And the power rating of each regional PSU.The power consumption of the per unit area of screen or specification that can be by the fabricator or can determine by measuring when fully exporting surely.
In operation, processor 120 is configured to analyze in real time the pixel content of each respective regions of received image signal, determines total pixel intensity summation of brightest area, and itself and the predetermined threshold that is stored in the storer 130 are compared.Content analysis is known, such as U.S. Patent No. 6,714,594 that is described in Dimitrova and the U.S. Patent Application Publication No.2004/0168205 of Nesvadba, quotes its full content herein with for referencial use.If the maximum region brightness value of determined brightest area or the brightness value that any one is regional surpass threshold value, then processor 120 is configured to carry out DPC and reduces whole screen output or luminance level.For the coverage that the output level is reduced minimizes, on behalf of ' on average ' of total image, the shape of desired region may best mode cut into slices.Performance has remarkable influence to region shape to DPC.
For example, in Fig. 1, screen 110 is divided into eight zones of numbering 1 to 8; Wherein each zone for example can be half of screen 110 height, perhaps has differing heights (that is, having the part screen height).When each zone in the analysis chart 1, with obvious, because the bright area in zone 2 and 3, these zones 2 and 3 all have than the high total pixel value in any other zone.High pixel value causes screen output level to be reduced (if being higher than threshold value) probably in the zone 2 or 3.
Compared to Figure 1, Fig. 2 illustrates the screen with eight zones 210 that shows with Fig. 1 identical image, but each zone of screen 210 is complete (active) screen height.For example the regional analysis of being carried out by processor 120 shows that the zone 4 and 5 of Fig. 2 has the maximum pixel value.Yet, to the number percents in contributive each these zone 4 and 5 of bright area (such as the actual light-struck bright cloud of screen middle-jiao yang, function of the spleen and stomach of watching) far below zone shown in Figure 12 and 3.For the situation of the screen 210 of Fig. 2, total pixel intensity summations in each these zone 4 and 5 can be lower than threshold value, and therefore will can not cause reducing of screen output level.
In the example shown in Fig. 1 to 2, eight full-height zones among Fig. 2 provide than the height of eight and half among Fig. 1 (or part height) the better result in zone as can be seen, this is that promptly, screen output level reduces to be minimized because perhaps screen intensity is unaffected or reduce in total.This is because the top of image comprises that content and the zone brighter than the bottom are full-height in this example, causes equalization, and this equalization produces the regional luminance less than threshold value.Certainly, the top of image is not always bright than the bottom, yet, the more frequent really appearance of situation that the top of image is brighter than the bottom.Therefore, native system can have full-height zones, and this minimizes DPC operation and therefore keeps brightness of image on the wideest image range.Fig. 3 illustrates an embodiment of screen 310, and this screen has 256 * 144 pixels and is divided into 8 full-height zones, and each zone is 32 * 144 pixels.
As above-mentioned, each zone can have its oneself one or more power supply units (PSU).Can obtain PSU at a series of output voltages and power.In not having the conventional conventional screen of DPC, thereby each PSU must have enough power can drive its screen area when showing pure white image (that is high-high brightness/power).The feasible PSU that can use lower-wattage (and therefore more not expensive) of the combination of DPC, perhaps alternatively, each existing PSU can drive the bigger zone of this screen.
When calculating the required PSU ratings in each zone, the power reduction that is realized by DPC is taken into account to obtain the PSU of lower-wattage ratings.Therefore, if for example the DPC coefficient is 0.6, then drives the required peak power in this zone and be:
(P ZONE WITH NO DPC) * 0.6 watt
P wherein ZONE WITH NO DPCRequired power when on this zone, showing pure white image DPC inoperation.
The picture signal that analysis comprises the content (for example image) that will be presented on the screen to be determining the brightness value of each pixel, if do not have DPC to estimate this image to be displayed on the screen, each independent screen pixels is with the electric current that extracts.If the total current of all pixels in any one zone, so power surpasses threshold value, then whole screen output level correspondingly reduces, thereby is no more than the rated power of screen or PSU.
In order to realize the enough accurate estimates to the screen pixels performance, expectation is chosen in where carry out this content analysis in the signal path rightly.Fig. 4 illustrates block diagram 400, and this block diagram illustrates the signal path according to the LED screen of an embodiment, and wherein composite video signal 405 is received by Video Decoder 410 and is used for decoding.Signal process multiplexer (MUX) through decoding, and can be multiplexing so that signal resolution and screen resolution (for example mate by scaler 420, reduce), because typically, the resolution of input picture (for example, 720 * 576 pixels) usually a little more than the resolution (for example, 256 * 144 pixels) of LED screen.Therefore image resolution ratio is reduced to the resolution with LED screen coupling in scaler 420.
Graphical analysis should be carried out in certain position that can obtain whole input picture.This has got rid of the last stages of signal path, and the divided image data physically of the internal data distribution in the stage screen in the back is only to point to related data each part of screen.Analyze and preferably after scaler 420, carry out, because have pixel relationship one to one between view data and the LED screen after the scaler 420.The feasible many functions of graphical analysis that comprise of the combination of field programmable gate array (FPGA) 430 and a storage or storer 435 (having relevant microcontroller) can be implemented after scaler 420 and before signal distributes in screen 440.The output of FPGA 430 is provided to the piece processor for handling and providing a signal to line drive 455 to be used to drive screen 440.Carry out content analysis by FPGA 430 after being desirably in scaler 420.
Illustrate as Fig. 4, screen 440 comprises that internal data distribution device 460 is to point to related data the relevant portion of screen 440.Gamma corrector 465 provides Gamma correction.Also provide colour correction, be used for providing signal to be used for driving LED 480 and displaying contents or image on screen 440 to driver 475 by color corrector 470.
Property example as an illustration, illustrate at Fig. 4 and to carry out following hypothesis among the embodiment: in the output of scaler 420, there be (for example, 3 * 8 bit streams are used for ' R ' one by one, and one is used for ' G ' and one and is used for ' B ') in picture signal with 8 RGB (R-G-B) brightness data; And the LED electric current that is used for red, green and blue look LED equates.
Thereby hereinafter be described in the event sequence during the graphical analysis gain coefficient, this gain coefficient will be applied to signal path subsequently, thereby control screen output level is to obtain target power reduction ratio (Factor TARGET REDUC):
1. use anti-Gamma correction to these 8 RGB brightness datas and in this process, data are expanded to 3 * 9 place values.Anti-Gamma correction expects, thereby in view data actual displayed emulating image data before on the LED screen what taken place.For example, all images signal has the gamma characteristic of using in the source, with the dynamic range of the dark portion of stretching image before transmission.This characteristic is removed the display device planted agent.It is 3 * 9 place values that data are expanded, and the maximal value of each 9 place value is 341.When R, G and B value were sued for peace subsequently, the maximal value of this summation was 3 * 341=1023, and this value is 10 place values easily.
2. 9 RGB brightness values are sued for peace together and be used for the brightness value 0-1023 (being 10 now) of each pixel with generation.
3. to 10 pixel brightness value summations in each zone.
4. when finishing in the input picture field, relatively this regional summation is to find to have high-high brightness summation (ZoneSum MEASURED) the zone.It should be noted that during initial setting up, thereby system should be calibrated definite each regional maximum possible brightness summation (ZoneSum MAX POSS).This is by providing plain white background as image source and measure and realize as mentioned above.
5. calculate the gain coefficient that will be applied to led driver according to following formula:
Factor GAIN=ZoneSum MAX?POSS×Factor TARGET?REDUC/ZoneSum MEASURED
For example:
If: ZoneSum MAX POSS=800
And: ZoneSum MEASURED=600
And: Factor TARGET REDUC=0.6
Factor then GAIN=800 * 0.6/600=0.8
The gain that this means led driver must be multiply by 0.8 (promptly reducing) so that 0.6 target power reduction ratio to be provided.It should be noted that not to be desirably in when showing dark image to increase power, therefore also should use and prevent Factor GAINValue is greater than 1 formula.
Gain coefficient should be employed at the suitable stage place in signal path, thereby provides desired effects when appropriate.In fact spend the time period of a field to finish at the process of input picture field measurement pixel value and gain coefficient.Therefore, the gain coefficient that is calculated is relevant with process just in fact, promptly retardation a field.For using gain coefficient exactly, in the analysis 510 shown in Fig. 5 center Figure 50 0 with use between 520, picture signal can postpone a field, perhaps postpones to handle this picture signal institute's time spent amount.Therefore owing to postpone 530 from the field of the signal of FPGA 430 to LED 480, from the signal by analysis of FPGA 430 corresponding to the signal that just is being presented at by LED 480 on the screen 440.
The ideal point of using gain coefficient in the signal path is in color correction stage shown in Figure 4 470.Usually implement various adjustment to image RGB level just herein so that white balance and color uniformity coefficient accurately for example to be provided.The benefit that also has is that at this point, time delay (because DPC shown in Figure 5 analyzes 510) intrinsic in the data processing may equal a field time section, and therefore considers rightly by the delay 530 of Fig. 5.This cause this gain coefficient be applied to its based on correct data field (that is, suitable opportunity), rather than be applied to data from next, eliminated instantaneous PSU overload thus.
Can have practical difficulty when color correction stage 470 using gain coefficients, this is because this stage physically spreads over the whole zone of screen usually; Therefore it may be difficult applying it to all screen areas simultaneously.Correspondingly, so ineffective but easier stage of using gain coefficient is the downstream in data analysis stage among the same FPGA 430 that analyzes of implementation content.This benefit that has has provided the easy visit to data stream, but the shortcoming that has is that gain coefficient is applied to the data fields of following its applicable data field.This theoretical shortcoming observer in practice can be noticed hardly.The instantaneous PSU overload duration that can cause in theory lacks (for example, field) and can easily be tackled by PSU no problem ground usually.
The effect of the DPC following parameter shown in the use table 1 is demonstrated, and wherein pixel resolution is the following measurement that the LED screen of 256 * 144 pixels has been furnished with DPC and table 1 record, and this table 1 illustrates and do not have the comparison of the value of DPC.
Parameter No DPC DPC is arranged
Maximum power dissipation: ??3.8kW ??2.4kW
The power reduction coefficient: ??- ??0.63
The type of power supply supply: Three-phase 400V 16A Single-phase 230V 13A
The number of 320W PSU: ??24 ??9
The number of cooling fan: ??8 ??4
White background on the region area of maximum light output-50%: ??2000cd/m 2 ??2000cd/m 2
White background on the region area of maximum light output-76%: ??2000cd/m 2 ??1810cd/m 2
White background on the region area of maximum light output-100% ??2000cd/m 2 ??1350cd/m 2
Table 1
Fig. 6 to 8 illustrates on the x axle at screen (256 pixels of every row) and goes up the curve map that unit on irradiated number of lines of pixels and the y axle concerns between for the source current that exchanges ampere, wherein the intermediate vertical dotted line is the DPC threshold value, and right dotted line is the line that whole screen is driven the place for all row are illuminated.Particularly, Fig. 6 illustrates the curve 600 that concerns between the size of measured screen power supplies electric current and irradiated area area, and it illustrates the effect of DPC when All Ranges is driven under the following conditions: the pure white test pattern; All Ranges is driven; Screen size is 256 * 144 pixels (h * v); Use AC current transducer to measure source current; And supply voltage is for exchanging 235V.
Fig. 7 illustrates the curve 700 that concerns between the size of measured PSU output current and irradiated area area, and it illustrates the effect of DPC when a zone is driven under the following conditions: the pure white test pattern; Only a zone is driven; Area size is 32 * 144 pixels (h * v); And use the DC current converter to measure the PSU electric current.
Fig. 8 illustrates the curve 800 that concerns of the small screen area between the size of measuring light output and irradiated area area, it illustrates the effect of DPC when a zone is driven under the following conditions: the pure white test pattern; A zone is driven; Area size is 32 * 144 pixels (h * v); And use Minolta CS-100 chromascope 5 meters measuring light outputs.The light output dependence that it should be noted that each pixel is in the LED temperature.
Virtual zone analysis is the alternate embodiment of DPC subregion.The said method that relates to the zone of fixed position is worked well for most of iconographies.Yet have such example, wherein on the screen lentamente everywhere the bright graph image of tracking can cause the interior perhaps image observation person who is presented on the screen to notice DPC.
Fig. 9 illustrates the system 900 with the screen 910 that is divided into eight zones, and big bright image object (for example content images part or image object 920) moves from position A to position B tracking or at screen 910.As Fig. 2, screen 910 is divided into eight equal full-height zones 1 to 8.Yet; at big bright image object 920 lentamente in tracking or the situation that on screen 910, moves; then can there be such time; for example at object 920 when (virtually) fills a zone (for example zone 7) virtually; at position A place; such as when zone total pixel intensity of 7 during, may cause DPC to reduce total brightness of image greater than the DPC threshold value.The time that can have other, for example, when object 920 at position B place, this moment, object 920 spread all over two zones, and is for example regional 4 and 5, this can not cause DPC to reduce total brightness, because total pixel intensity in any one zone is less than the DPC threshold value.
When image object 920 moved, the effect of DPC was the brightness bob lentamente that makes whole screen.This effect can be eliminated by adopting Virtual zone analysis.As preamble, Virtual zone analysis relates to the zone 1 to 8 of analyzing each 32 * 144 pixel and the zone of determining to have the high-high brightness summation.Yet, be not 32 * 144 possible (zones of h * v) of each that only use eight zones that are directly linked to its own PSU, Virtual zone analysis to watch can to exist in the whole screen.
Figure 10 illustrates system 1000, and it is configured to utilize the notion of Virtual zone analysis.First analyzes leftmost 32 * 144 pixel regions (segmentation 1020 is as virtual region 1) watch screen 1010 and calculates the total brightness summation of this virtual region 1 in the same manner with fixed area.Second analyzes a move right pixel (segmentation 1030 is as virtual region 2) and calculate the total brightness summation of this virtual region once more of virtual region.The 3rd analyzes the mobile more to the right pixel of virtual region, like that.This process repeats always, and up to the right side that reaches screen, shown as the segmentation 1040 of screen 1010, this is segmented into virtual region 225.At screen 910 is that 144 pixels * 256 pixel and each zone have in this example of 32 * 144 pixels, and the zone is moved gradually by a pixel ground, always has 225 virtual regions.Total pixel intensity summation of 225 virtual regions is mutually relatively determining to have the zone of maximum summation, and should the maximum summation uses with gain coefficient in previous identical mode and use DPC.
Compare with the fixed area position, this Virtual zone analysis method has the advantage of removing the effect of describing of not expecting of beating in our example, but has the shortcoming of generation than the harmonic(-)mean screen intensity.
Description in view of herein one skilled in the art will recognize that, various adjustment can also be provided.The operation steps of the method is particularly suited for being implemented by computer software programs.Application data and other data are received by controller or processor, are used for it is configured to carry out operation steps according to this system and method.This software, application data and other data certainly are implemented in the computer-readable medium, such as integrated chip, peripheral unit or storer (such as this storer or be coupled to other storer of processor).
This computer-readable medium, storer and/or arbitrarily other storer can be the combination of long term memory, short-term storage or long-term and short-term storage.Method, operation steps and the function of this processor/controller of these memory configurations to implement to disclose herein.Storer can be distributed or local, and the processor of Attached Processor wherein can be provided can be distributed or odd number.This storer may be embodied as electricity, magnetic or optical memory, perhaps the combination in any of the memory storage of these or other type.
Processor and storer can be any types.Processor can carry out various described operations and execution is stored in the interior instruction of storer.This processor can be special use or universal integrated circuit.In addition, this processor can be to be used for the specialized processor of carrying out according to this system or can be general processor, and the only function operation in wherein many functions is carried out according to this system being used for.This processor can utilize program part, a plurality of program segment to operate, and perhaps can be the hardware unit that utilizes special use or multi-usage integrated circuit.
At last, above-mentioned discussion is intended to only set forth this system and should be read as claims are restricted to any specific embodiment or embodiment group.Therefore, although describe native system particularly in detail with reference to its concrete exemplary embodiment, but the spirit and scope that should be understood that those of ordinary skills can expect many adjustment and alternative and do not deviate from as the wideer of the native system listed in following claims and intend containing.Instructions and accompanying drawing correspondingly should be considered as illustrative and not be intended to limit the scope of appended claims.
In the process of explaining appended claims, be to be understood that:
A) word " comprises " does not get rid of other assembly or the step that those are not listed in the specific rights requirement;
B) word " " or " " before the element does not get rid of a plurality of such elements;
C) any reference symbol in the claim does not limit its scope;
D) some " devices " available structure or function same or different item or hardware or software realization represented;
E) disclosed arbitrary element can and be made up of hardware components (for example comprise discrete with integrated electronic circuit), software section (for example computer program).
F) hardware components can comprise analog-and digital-part the two one or both of.
G) unless expressly stated otherwise,, any disclosed device or its parts can be combined in together or are divided into more parts; And
H) unless spell out otherwise and the particular sequence of the every step of failed call.

Claims (19)

1. a display system (100) comprising:
Screen (110), it is configured to the screen intensity display image; And
Processor (120), it is configured to this screen (110) is divided into a plurality of zones, determines the regional luminance that each is regional; And, reduce this screen intensity with a coefficient when the regional luminance in one of these a plurality of zones during greater than threshold value.
2. display system as claimed in claim 1 (100), wherein each zone is driven by separately power supply (140).
3. display system as claimed in claim 1 (100), wherein this threshold value is associated with the maximum rated current of extracting from the power supply (140) of drive area.
4. display system as claimed in claim 1 (100), wherein this coefficient is decreased to the brightness of highest region territory the value that is equal to or less than this threshold value.
5. display system as claimed in claim 1 (100), size that wherein should the zone is determined based on following at least one factor: the power rating of the power consumption of every selection area of this screen (110), this coefficient and power supply that should the zone when full normal light output.
6. display system as claimed in claim 1 (100), wherein this processor (120) is configured to determine this regional luminance by the real time content analysis of this image.
7. display system as claimed in claim 1 (100) also comprises delay circuit (530) to form delayed image, and this delayed image is associated with the treated image of this processor (120), is used for determining this coefficient.
8. display system as claimed in claim 1 (100) also comprises scaler (420), and this scaler is configured to the signal resolution of this image that will be received and the screen resolution coupling of this screen (110).
9. display system as claimed in claim 1 (100), wherein this processor (120) further is configured to determine the regional luminance in the output of this scaler (420).
10. light display system as claimed in claim 1 (100), wherein this processor (120) further is configured to using this coefficient in the output of this scaler (420) or during the colour correction at this image.
11. display system as claimed in claim 1 (100), wherein this processor (120) further is configured to: measure the virtual region brightness of a plurality of virtual regions of mobile preset distance on this screen and determine maximum virtual region brightness.
12. display system as claimed in claim 1 (100), wherein this processor (120) further is configured to: the virtual region brightness of measuring a plurality of virtual regions of mobile preset distance on this screen, and during greater than threshold value, reduce this screen intensity with this coefficient in this virtual region brightness of one of these a plurality of virtual regions.
13. a method that is used to control display system (100) comprises the steps:
With screen intensity at screen (110) display image;
This screen (110) is divided into a plurality of zones;
Determine the regional luminance that each is regional; And
When the regional luminance in one of these a plurality of zones during, reduce this screen intensity with a coefficient greater than threshold value.
14. method as claimed in claim 13 also comprises the step of determining the size that this is regional based on following at least one factor: the power rating of the power consumption of every selection area of this screen (110), this coefficient and power supply that should the zone when full normal light output.
15. method as claimed in claim 13, wherein determining step is determined this regional luminance by the real time content analysis of this image.
16. method as claimed in claim 13 comprises also postponing this image to form the step of delayed image that this delayed image is associated with the treated image that is used for definite this coefficient.
17. method as claimed in claim 13 also comprises the steps: to measure the virtual region brightness of going up a plurality of virtual regions of mobile preset distance at this screen (110), and determines maximum virtual region brightness.
18. a computer program, when being carried out by computing machine, this computer program can be implemented as claim 13 or 17 described methods.
19. the record carrier of a storage computer program as claimed in claim 18.
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