CN101681583B - Dynamic power control for display screens - Google Patents
Dynamic power control for display screens Download PDFInfo
- Publication number
- CN101681583B CN101681583B CN2008800163571A CN200880016357A CN101681583B CN 101681583 B CN101681583 B CN 101681583B CN 2008800163571 A CN2008800163571 A CN 2008800163571A CN 200880016357 A CN200880016357 A CN 200880016357A CN 101681583 B CN101681583 B CN 101681583B
- Authority
- CN
- China
- Prior art keywords
- screen
- image
- zone
- processor
- display system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital 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
- G06F3/1446—Digital 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/22—Control 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
- G09G3/30—Control 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
- G09G3/32—Control 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]
Landscapes
- 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
A display system (100) includes a screen (110) configured to display an image with a screen brightness; and a processor (120) configured to divide the screen (110) into zones, to determine a zone brightness of each zone, e.g., via real time content analysis of the image displayed in the zone; and to reduce the screen brightness by a factor when the zone brightness of one of the zones is greater than a threshold. The threshold is associated with a maximum rated current drawn from a power supply (140) driving a zone, and each zone may be driven by a respective power supply (140). The processor (120) may also be configured to measure virtual zone brightness of virtual zones which are moved by a predetermined distance across the screen, and reduce the screen brightness by the factor when the virtual zone brightness of one of the virtual zones is greater than the threshold.
Description
Technical field
Native system and method relate to and are used for coming dynamically to change 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 their generations are enough to supply the high-definition picture of 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 the physical culture and public venue all over the world.
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, power consumption is high, 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 with 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 present the expense that provides power demand, voltage and/or electric current to be associated to the LED screen.
As above-mentioned, typically, the power consumption of LED screen and institute's luminance of display images are proportional.Image is in the brightness content vary, do 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.Factors 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 supplied power 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 supplied power 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 time.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 that screen is inner must be handled when peak power is moved continuously the heat of the increase that (, during the worst case of when designing screen display, using) produced.Correspondingly, more several fans ventilates, and makes cost, weight and noise increase explicitly.
Be clear that expectation reduces the power requirement of screen.
WO 2005/088593A1 has disclosed a kind of Active Matrix Display that power consumption reduces that has.According to this document, which row pixel of having analyzed this Active Matrix Display has maximum video load.After all the row loads were determined, supply voltage was set to be suitable for the level of the mxm. of this row load.
In addition, US 2005/0264492 has disclosed a kind of active matrix electroluminescence device, and wherein the driving transistors of each pixel is with the input drive signal that depends on this pixel and the mode Be Controlled of total brightness level.Therefore, pixel can be controlled to limit the maximum current that pixel is extracted.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 institute's dim and dry conspicuous shortcoming of display image to some extent.As quote in full the patent No.7 of the Nakamura that is incorporated into this, and 193,592 is said, 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 pixel is by driving from the drive current that drives circuit.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 through 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 confirms the regional luminance that each is regional through the real time content analysis of images displayed 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.The also configurable one-tenth of processor: measure the virtual region brightness of on this screen, moving a plurality of virtual regions of predetermined number pixel, and, reduce this screen intensity with this coefficient when the virtual region brightness of one of these a plurality of virtual regions during greater than threshold value.
Through the detailed description that hereinafter provides, other applications of this system and method will become obvious.Describe the exemplary embodiment that this system and method is shown with concrete example in detail although should be understood that this, be only used for illustration purpose, but not be intended to limit scope of the present invention.
Description of drawings
Through following description, accompanying claims and accompanying drawing, with these and further feature, aspect and the advantage of understanding 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 example;
Fig. 4 illustrates block diagram, and this block diagram illustrates the signal path according to the LED screen of illustrative example;
Fig. 5 illustrates block diagram, and this block diagram comprises the delay element according to another illustrative example;
Fig. 6 to 8 illustrates various curve maps, and this curve map demonstration is according to the effect of the DPC of another illustrative example;
Fig. 9 illustrates the split screen according to another illustrative example, and big bright image object moves on screen; And
Figure 10 illustrates a plurality of virtual regions according to another illustrative example.
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 through explanation illustrates the specific embodiment that said system and method can be implemented in the accompanying drawing.These embodiment enough at length describe, 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 the scope of this system.
Therefore following detailed description should not understood with restrictive mode, and the scope of this system is defined by appended claims.Here among the figure last (many) of reference number positions typically corresponding to figure number, exception be that the same components that in a plurality of figure, occurs use same reference numerals identifies.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 and the quality of the image of low brightness content.No matter when run into the image that comprises high brightness content, DPC automatically and basically at once is decreased to brightness of image total power consumption is maintained the level in the predetermined restriction.
Except do not influence have in 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 inside needs littler/still less power supply unit, so reduces the cost and the weight of screen.The heat that the power consumption that reduces causes reducing generates, 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 quietly operation.
Do not influence in having native system and method with the picture quality of low brightness content according to using DPC to reduce power consumption, 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 through 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 through confirming to analyze from real time content; The pixel brightness value of brightest area is confirmed in the zone of using in the whitest and/or the light color image perhaps to fill.
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 zone arrives this value, will cause extracting maximum rated current from driving this regional PSU.
If the determined regional luminance value in any 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 of highest zone 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 confirmed 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 the regional luminance in any zone 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 the brightness in any zone surpasses change screen intensity when being stored in the threshold value in the storer 130 (storer 130 is coupled to processor 120).As known, storer 130 for example also can be stored other data and supply processor to carry out to carry out DPC with the application software that comprises software instruction.
In operation, processor 120 is configured to analyze in real time the pixel content of each respective regions of received image signal, confirms total pixel intensity summation of brightest area, and itself and the predetermined thresholds that are stored in the storer 130 are compared.Content analysis is known, such as the open No.2004/0168205 of the U.S. Patent application of United States Patent(USP) No. that is described in Dimitrova 6,714,594 and Nesvadba, quotes its full content here with for referencial use.If the maximum region brightness value of determined brightest area or any one regional brightness value 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 regions possibly 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 the half the 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.The regional analysis of for example 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 so will can not cause reducing of screen output level.
In the instance shown in Fig. 1 to 2; Can find out that 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; 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 top of the image situation brighter than the bottom more often occurs really.Therefore, native system can have full-height zones, and this minimizes the DPC operation and therefore keeps the 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 when showing pure white image (that is high-high brightness/power), can drive its screen area.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 confirming 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 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 is (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 combination of field programmable gate array (FPGA) 430 and a storage or storer 435 (having relevant microcontroller) makes the many functions that comprise graphical analysis after scaler 420 and before signal distributes in screen 440, to implement.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 like 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 colour correction is provided, is 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.
As illustrated examples; Illustrate at Fig. 4 and to carry out following hypothesis among the embodiment: in the output of scaler 420; There is (for example, 3 * 8 bit streams-are used for ' R ', 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 led equates.
Thereby hereinafter is described in the event sequence during the graphical analysis gain coefficient, and 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 is expected, thereby what has taken place the emulating image data before the view data actual displayed is on the LED screen.For example, all images signal has the gamma characteristic of using in the source, with the dynamic range of the dark portion of image that before transmission, stretches.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 through provide plain white background as scheming image source and measuring and realize as stated.
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 in the suitable time desired effects is provided.In fact spend the time period of a field to accomplish to 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 FPGA 430 through the signal analyzed corresponding to just being presented at the signal on the screen 440 by LED 480.
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 possibly equal a field time section, and therefore considers rightly through 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.
When color correction stage 470 using gain coefficients, can have practical difficulty, this is because this stage physically spreads over the whole zone of screen usually; Therefore it possibly 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 optical output-50%: | 2000cd/m 2 | 2000cd/m 2 |
| White background on the region area of maximum optical output-76%: | 2000cd/m 2 | 1810cd/m 2 |
| White background on the region area of maximum optical output-100% | 2000cd/m 2 | 1350cd/m 2 |
Table 1
Fig. 6 to 8 illustrates and goes up irradiated number of lines of pixels at screen (256 pixels of every row) on the x axle is to exchange the curve map that concerns between the source current of ampere with the y axle unit of attending; 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, its illustrate when All Ranges under following condition when driving the effect of DPC: 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, its illustrate when a zone under following condition when driving the effect of DPC: 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 between the size of measuring light output and irradiated area area, concerns of the small screen area, and it illustrates when zone effect of DPC during the quilt driving under following condition: 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 for most of iconographies well.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, big bright image object (for example content images part or image object 920) from the position A to the position B tracking or move at screen 910.Like Fig. 2, screen 910 is divided into eight equal full-height zones 1 to 8.Yet; In big bright image object 920 situation that tracking perhaps moves on screen 910 lentamente; Then can there be such time, when for example filling a zone (for example zone 7) on object 920 virtual ground (virtually), the A place in the position; Such as when zone total pixel intensity of 7 during, possibly 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 in the 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 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 through adopting Virtual zone analysis.Like preamble, Virtual zone analysis relates to the zone 1 to 8 of analyzing each 32 * 144 pixel and the zone of confirming 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 with FX identically.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 like 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 by a pixel ground gradually, always has 225 virtual regions.Total pixel intensity summation of 225 virtual regions is each other relatively confirming to have the zone of maximum summation, and should the maximum summation uses with gain coefficient with previous identical mode and use DPC.
Compare with the FX position, this Virtual zone analysis method has the advantage of removing the effect of in our example, describing of not expecting of beating, but has the shortcoming of generation than the harmonic(-)mean screen intensity.
The description in view of here 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 is received by controller or processor with other data, is used for it is configured to carry out the 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 here.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 said operations and execution is stored in the instruction in the storer.This processor can be special use or universal integrated circuit.In addition, this processor can be the specialized processor that is used for 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-purpose or multi-usage integrated circuit.
At last, above-mentioned discussion is intended to only set forth this system and should be read as accompanying claims is restricted to any specific embodiment or embodiment group.Therefore; Although describe native system particularly in detail with reference to its concrete exemplary embodiment; But 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 with intend spirit and the scope that contains.Instructions and accompanying drawing correspondingly should be regarded 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) the arbitrary element that is disclosed 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) only if spell out, otherwise and the particular sequence of failed call each item step.
Claims (14)
1. a display system (100) comprising:
Screen (110), it is configured to the screen intensity display image; And
Processor (120),
It is characterized in that:
The screen area that is defined; Said zone comprises the array of pixel and represents this screen zones corresponding with section total image (110); Wherein said zone has the width of a plurality of pixels, makes the image object (920) that on said screen, moves can fill a zone virtually and perhaps can spread all over two zones; With
Said processor (120) is configured to confirm the regional luminance of each Probability Area that can exist in the whole screen; 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 this threshold value is associated with the maximum rated current of extracting from the power supply (140) of drive area.
3. display system as claimed in claim 1 (100), wherein this coefficient is decreased to highest zone brightness the value that is equal to or less than this threshold value.
4. display system as claimed in claim 1 (100), wherein this processor (120) is configured to confirm this regional luminance through this image real-time content analysis.
5. 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 confirming this coefficient.
6. display system as claimed in claim 1 (100) also comprises scaler (420), and this scaler is configured to the screen resolution coupling with the signal resolution of this image that is received and this screen (110).
7. display system as claimed in claim 6 (100), wherein this processor (120) further is configured to confirm the regional luminance in the output of this scaler (420).
8. display system as claimed in claim 6 (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.
9. 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 that on this screen, move preset distance and confirm maximum virtual region brightness.
10. display system as claimed in claim 1 (100); Wherein this processor (120) further is configured to: measure the virtual region brightness of on this screen, moving a plurality of virtual regions of preset distance; 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.
11. a method that is used to control display system (100) comprises the steps:
With screen intensity at screen (110) display image,
It is characterized in that said method comprises:
The definition screen area; Said zone comprises the array of pixel and represents this screen zones corresponding with section total image (110); Wherein each zone has the width of a plurality of pixels, makes the image object (920) that on said screen, moves can fill a zone virtually and perhaps can spread all over two zones;
The regional luminance of each Probability Area of confirming to exist in the whole screen; 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.
12. method as claimed in claim 11, wherein definite step is confirmed this regional luminance through this image real-time content analysis.
13. method as claimed in claim 11 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.
14. method as claimed in claim 11 also comprises the steps: to measure the virtual region brightness of going up a plurality of virtual regions that move preset distance at this screen (110), and confirms maximum virtual region brightness.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07108345.5 | 2007-05-16 | ||
| EP07108345 | 2007-05-16 | ||
| PCT/IB2008/051844 WO2008142602A2 (en) | 2007-05-16 | 2008-05-09 | Dynamic power control for display screens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101681583A CN101681583A (en) | 2010-03-24 |
| CN101681583B true CN101681583B (en) | 2012-12-12 |
Family
ID=39689152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800163571A Expired - Fee Related CN101681583B (en) | 2007-05-16 | 2008-05-09 | Dynamic power control for display screens |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2153430A2 (en) |
| JP (1) | JP2010527043A (en) |
| KR (1) | KR20100021459A (en) |
| CN (1) | CN101681583B (en) |
| TW (1) | TW200912886A (en) |
| WO (1) | WO2008142602A2 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009030176B4 (en) * | 2009-06-24 | 2014-02-06 | Init Innovative Informatikanwendungen In Transport-, Verkehrs- Und Leitsystemen Gmbh | Arrangement for driving light-emitting diodes |
| JP5574812B2 (en) * | 2010-05-12 | 2014-08-20 | キヤノン株式会社 | Image processing apparatus and image processing method |
| JP2012247540A (en) * | 2011-05-26 | 2012-12-13 | Mitsubishi Electric Corp | Video display device |
| CN102768820B (en) * | 2012-07-23 | 2015-01-28 | 深圳市大象视界科技有限公司 | LED large screen display device and driving circuit and driving method thereof |
| CN104460940A (en) * | 2014-11-14 | 2015-03-25 | 华中科技大学 | Energy-saving display method and system of screen of smart phone or tablet personal computer |
| EP3274984A1 (en) | 2015-03-23 | 2018-01-31 | Dolby Laboratories Licensing Corporation | Dynamic power management for an hdr display |
| US10297191B2 (en) | 2016-01-29 | 2019-05-21 | Samsung Display Co., Ltd. | Dynamic net power control for OLED and local dimming LCD displays |
| US10009570B2 (en) | 2016-02-24 | 2018-06-26 | International Business Machines Corporation | Thermal management of display screens |
| KR101884233B1 (en) | 2016-08-26 | 2018-08-01 | 삼성전자주식회사 | Display apparatus and driving method thereof |
| KR102208872B1 (en) | 2016-08-26 | 2021-01-28 | 삼성전자주식회사 | Display apparatus and driving method thereof |
| WO2019041321A1 (en) * | 2017-09-01 | 2019-03-07 | 深圳传音通讯有限公司 | Mobile terminal screen switch-off control method, apparatus, and computer storage medium |
| WO2019138543A1 (en) * | 2018-01-12 | 2019-07-18 | 三菱電機株式会社 | Display device |
| WO2019186746A1 (en) * | 2018-03-28 | 2019-10-03 | 三菱電機株式会社 | Led display system, led display control device, and led display device |
| CN110007818B (en) * | 2019-03-04 | 2022-08-12 | 深圳威尔视觉科技有限公司 | Single-machine screen resource layout method and related device |
| CN110767170B (en) * | 2019-11-05 | 2020-11-10 | 深圳市华星光电半导体显示技术有限公司 | Picture display method and picture display device |
| WO2022029875A1 (en) * | 2020-08-04 | 2022-02-10 | 三菱電機株式会社 | Led display system, led display control device, and led display device |
| CN113851089B (en) * | 2021-09-01 | 2022-11-29 | 深圳创维－Rgb电子有限公司 | Display brightness control method and device, intelligent terminal and storage medium |
| CN113920951A (en) * | 2021-09-15 | 2022-01-11 | 上海祺壹智能科技有限公司 | Method for refreshing screen with low current |
| CN116884341B (en) * | 2023-09-06 | 2024-01-05 | 长春希达电子技术有限公司 | Wall-mounted LED display device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1480195A1 (en) * | 2003-05-23 | 2004-11-24 | Barco N.V. | Method of displaying images on a large-screen organic light-emitting diode display, and display used therefore |
| CN1797082A (en) * | 2004-12-30 | 2006-07-05 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and its driving method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10124003A (en) * | 1996-10-18 | 1998-05-15 | Fujitsu General Ltd | Multi-screen plasma display device |
| JP3636573B2 (en) * | 1997-06-27 | 2005-04-06 | パイオニア株式会社 | Brightness control device |
| US7839365B2 (en) * | 2002-09-04 | 2010-11-23 | Koninklijke Philips Electronics N.V. | Control of current supplied by a transistor to a pixel in an electroluminescent display device |
| JP2004163673A (en) | 2002-11-13 | 2004-06-10 | Toshiba Corp | Display device |
| KR100501718B1 (en) * | 2002-11-30 | 2005-07-18 | 삼성전자주식회사 | Image displayer with protecting address driver |
| WO2005088593A1 (en) * | 2004-03-10 | 2005-09-22 | Koninklijke Philips Electronics N.V. | An active matrix display with reduction of power onsumption |
| WO2007004155A2 (en) * | 2005-07-04 | 2007-01-11 | Koninklijke Philips Electronics N.V. | Oled display with extended grey scale capability |
| WO2007061811A1 (en) * | 2005-11-18 | 2007-05-31 | Cree, Inc. | Solid state lighting panels with variable voltage boost current sources |
| US20070285379A1 (en) * | 2006-06-09 | 2007-12-13 | Samsung Electronics Co., Ltd. | Liquid crystal display and method of adjusting brightness for the same |
-
2008
- 2008-05-09 EP EP08751192A patent/EP2153430A2/en not_active Ceased
- 2008-05-09 CN CN2008800163571A patent/CN101681583B/en not_active Expired - Fee Related
- 2008-05-09 KR KR1020097026140A patent/KR20100021459A/en not_active Application Discontinuation
- 2008-05-09 JP JP2010508014A patent/JP2010527043A/en active Pending
- 2008-05-09 WO PCT/IB2008/051844 patent/WO2008142602A2/en active Application Filing
- 2008-05-13 TW TW097117602A patent/TW200912886A/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1480195A1 (en) * | 2003-05-23 | 2004-11-24 | Barco N.V. | Method of displaying images on a large-screen organic light-emitting diode display, and display used therefore |
| CN1797082A (en) * | 2004-12-30 | 2006-07-05 | Lg.菲利浦Lcd株式会社 | Liquid crystal display device and its driving method |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2001-142409A 2001.05.25 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008142602A2 (en) | 2008-11-27 |
| KR20100021459A (en) | 2010-02-24 |
| TW200912886A (en) | 2009-03-16 |
| WO2008142602A3 (en) | 2009-03-12 |
| JP2010527043A (en) | 2010-08-05 |
| CN101681583A (en) | 2010-03-24 |
| EP2153430A2 (en) | 2010-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101681583B (en) | Dynamic power control for display screens | |
| US10460679B2 (en) | Power management for modulated backlights | |
| CN101308649B (en) | Image display apparatus and driving method thereof | |
| US10409544B2 (en) | Display device and multi display device | |
| CN101599258B (en) | Liquid crystal display wall and control method thereof | |
| US9437127B2 (en) | Device and method for displaying image, device and method for supplying power, and method for adjusting brightness of contents | |
| CN104715737B (en) | Display device and its brightness control method | |
| CN103731590B (en) | Display device and its control method | |
| US8760386B2 (en) | Display device and method for driving the same | |
| CN111312143B (en) | Display device, driving method and driving device thereof, and computer-readable storage medium | |
| CN102213864A (en) | Image display device | |
| US11176872B2 (en) | Display apparatus and controlling method thereof | |
| Guterman et al. | 75.3: Is brighter always better? the effects of display and ambient luminance on preferences for digital signage | |
| US20110063203A1 (en) | Displaying Enhanced Video By Controlling Backlight | |
| KR102628663B1 (en) | Display apparatus and driving method thereof | |
| CN101777322B (en) | Liquid crystal display television system | |
| KR101046114B1 (en) | Low Power Driven LED Display Board | |
| CN101604509B (en) | Image-displaying method | |
| KR102390515B1 (en) | Method for managing managing power consumption of LED(light emitting diode) sign based on ON/OFF operation control and luminance control and LED sign for performing the method | |
| US9368087B2 (en) | Display backlight normalization | |
| US20180018923A1 (en) | Liquid crystal display and method for lowering power consumption of liquid crystal display | |
| CN117156623A (en) | LED high-power lamp brightness adjustment method, system and storage medium | |
| CN103347216A (en) | Intelligent LED television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20140509 |