CN101783115B - Display device and control method thereof - Google Patents
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- CN101783115B CN101783115B CN2010100033295A CN201010003329A CN101783115B CN 101783115 B CN101783115 B CN 101783115B CN 2010100033295 A CN2010100033295 A CN 2010100033295A CN 201010003329 A CN201010003329 A CN 201010003329A CN 101783115 B CN101783115 B CN 101783115B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/58—Control of contrast or brightness in dependence upon ambient light
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- 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
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
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- 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
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Abstract
The invention relates to a display device and control method thereof. The invention discloses a display device technology, in which an illumination sensor senses illumination of surroundings of a location where a display device is installed and image signals to be displayed are received. An average picture level of a received signal is detected and a controller controls brightness of a backlight associated with the display device based on the illumination sensed by the illumination sensor and the detected average pixel value.
Description
Technical field
The present invention relates to the display device technology.
Background technology
The liquid crystal display that uses LCD (LCD) is controlled the transmittance of liquid crystal cells, display image thus according to vision signal.Liquid crystal display is embodied as active array type, wherein is provided with switching device for each unit.In some instances, liquid crystal display is applied to monitor, business machine, cellular display of computing machine etc.
The liquid crystal display of active array type uses thin film transistor (TFT) (below be called " TFT ") as switching device.Liquid crystal display comes the brightness of control display screen through the control backlight illumination.
Summary of the invention
In one aspect, a kind of display device is provided, this display device comprises: illuminance transducer, this illuminance transducer are configured to the illumination around the installation site of said display device is carried out sensing; And viewdata receiver, this viewdata receiver is configured to receive picture signal to be shown.Said display device also comprises: the picture level detecting device, and this picture level detecting device is configured to detect and export the average picture level of the signal that is received by said viewdata receiver; And controller, this controller is configured to control the backlight brightness relevant with said display device based on the average pixel value that the said illumination that is sensed by said illuminance transducer and said picture level detecting device are exported.
Implementation can comprise one or more in the following characteristic.For example, said display device can comprise storage unit, this storage unit be configured to store with corresponding to the relevant data of the backlight control value of illumination level.In this example; Said controller can be configured to through the corresponding data of illumination level that sense from said memory unit access and said illuminance transducer and use the data of being visited and said average pixel value that said picture level detecting device is exported is set at least one register value that said brightness backlight is controlled, thereby controls the said backlight brightness relevant with said display device based on the said average pixel value that the said illumination that is sensed by said illuminance transducer and said picture level detecting device are exported.
Can come said illumination level is divided into groups to each preset range in a plurality of preset ranges, and, be stored in the said storage unit with can comprise and the corresponding equation of each illumination group corresponding to the relevant data of the backlight control value of illumination level.With the corresponding said equation of each illumination group can be to have the mean pixel level as independent variable, the coefficient that is directed against said independent variable and the linear equation of constant.The said average pixel value that said controller can be configured to use said picture level detecting device to be exported is set said at least one register value for the result of said equation.
Can come said illumination level is divided into groups to each preset range in a plurality of preset ranges; And, be stored in the said storage unit with corresponding to the relevant data of the backlight control value of illumination level can be the register value with corresponding each mean pixel level of each illumination group.Can based on to the said illumination that senses by said illuminance transducer, will unify the picture level that the dazzle value is reduced to said display device required below the specified level, confirm said register value.Said register value can be inversely proportional to said illumination level.
In some implementations, said controller also can be configured to control the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight.In these implementations; Said controller can be configured to through confirming the said time quantum that has been used backlight and according to coming at least one set-up register value of controlling said brightness backlight is regulated with the corresponding mode of the determined said time quantum that has been used backlight, thereby controls the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight.
In some instances, the intensity of variation of the said controller said mean pixel level that also can be configured to be exported based on said picture level detecting device is controlled the said backlight brightness relevant with said display device.In these examples; Said controller can also be configured to through following processing; Thereby the intensity of variation of the said mean pixel level of being exported based on said picture level detecting device is controlled the said backlight brightness relevant with said display device: the intensity of variation of confirming the said mean pixel level that said picture level detecting device is exported; The intensity of variation and the preset level of said mean pixel level are compared; Judge relatively based on said whether the intensity of variation of said mean pixel level has exceeded said preset level, and the period of change of said mean pixel level is divided into a plurality of steps levels and grade in turn regulates the said backlight brightness relevant with said display device according to the said step in response to the intensity of variation of said mean pixel level has exceeded the judgement of said preset level.
On the other hand, a kind of method of controlling display device is provided, this method may further comprise the steps: come the illumination around the installation site of said display device is carried out sensing by illuminance transducer; And receive picture signal to be shown.Said method is further comprising the steps of: the average picture level that detects the signal that receives; And control the backlight brightness relevant based on detected average pixel value and by the said illumination that said illuminance transducer senses with said display device by controller.
Implementation can comprise one or more in the following characteristic.For example, said method can may further comprise the steps: in storage unit the storage with corresponding to the relevant data of the backlight control value of illumination level.In this example; Said method can may further comprise the steps: examine the corresponding data of illumination level that sense from said memory unit access and said illuminance transducer, and use the data and the detected average pixel value of being visited to set at least one register value that said brightness backlight is controlled.
Said method also can may further comprise the steps: each scope in a plurality of scopes comes said illumination level is divided into groups, and storage and the corresponding equation of each illumination group.In addition, said method can may further comprise the steps: each scope in a plurality of scopes comes said illumination level is divided into groups, and stores the register value that is directed against with corresponding each mean pixel level of each illumination group.
In some implementations, said method can may further comprise the steps: control the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight.In these implementations, said method can may further comprise the steps: confirm the said time quantum that has been used backlight; And, according to coming at least one set-up register value of controlling said brightness backlight is regulated with the corresponding mode of the determined said time quantum that has been used backlight.
In some instances, said method can may further comprise the steps: control the said backlight brightness relevant with said display device based on the intensity of variation of detected mean pixel level.In these implementations, said method can may further comprise the steps: the intensity of variation of confirming the said mean pixel level that the picture level detecting device is exported; The intensity of variation and the preset level of said mean pixel level are compared; And, judge whether the intensity of variation of said mean pixel level has exceeded said preset level based on said comparison.Said method can may further comprise the steps: the judgement that has exceeded said preset level in response to the intensity of variation of said mean pixel level, and the period of change of said mean pixel level is divided into a plurality of steps levels and grade in turn regulates the said backlight brightness relevant with said display device according to the said step.
On the other hand, the computer-readable storage medium of at least a executable instruction that is encoded is provided, when processor was carried out said executable instruction, this executable instruction made said processor executable operations.Said operation comprises: the control illuminance transducer is with the illumination around the installation site of sensing display device; And receive picture signal to be shown.Said operation also comprises: average picture level to the received signal detects; And control the backlight brightness relevant with said display device based on detected average pixel value and by the said illumination that said illuminance transducer senses.
The implementation of the technology that any is described in disclosure text can comprise method or process, system or be stored in the instruction on the computer-readable recording medium.In following accompanying drawing and explanation, set forth the details of concrete implementation.Through the following explanation that comprises accompanying drawing and claims, can more be expressly understood further feature.
Description of drawings
Fig. 1 and Fig. 2 are the figure that is used to explain the illustrative methods of controlling backlight illumination;
Fig. 3 is the figure that the exemplary configurations of display device is shown;
Fig. 4 and Fig. 5 are used for explaining the unified dazzle value of use (unified glare rating, the figure of exemplary methods of operationthe UGR);
Fig. 6 and Fig. 7 are the figure that is used to explain exemplary process;
Fig. 8 is the figure that is used to explain exemplary brilliance control table;
Fig. 9 is used to explain the accumulative total service time backlight and the figure of the exemplary relation between the backlight illumination;
Figure 10 is used for explaining the exemplary operation of controlling backlight illumination in response to the sudden change of average picture level (APL);
Figure 11 is the process flow diagram that is used to explain the illustrative methods of controlling display device;
Figure 12 is the process flow diagram that is used to explain the illustrative methods of confirming equation;
Figure 13 is the process flow diagram that is used to explain the illustrative methods that changes register value; And
Figure 14 is the process flow diagram that is used to explain the illustrative methods of application register value.
Embodiment
Brilliance control backlight to relevant with display device (such as LCD) comes some technology are described.In some instances, display device carries out sensing to the illumination around the installation site of this display device, and receives picture signal to be shown.In these examples, display device average picture level to the received signal detects, and controls the backlight brightness relevant with this display device based on illumination that senses and detected average pixel value.Control the user's viewing experience that backlight illumination can improve the use display device based on detected illumination and average pixel value.
Fig. 1 shows the example of controlling the method for backlight illumination with the average brightness level of input image data with being inversely proportional to, and Fig. 2 shows the example of controlling the method for backlight illumination with the installation site illumination on every side of display device with being directly proportional.In some implementations, can be in the process of control backlight illumination, both improve the method shown in Fig. 1 and Fig. 2 the illumination around the average brightness level through considering input image data and the installation site of display device.
Fig. 3 shows the exemplary configurations of display device.As shown in the figure, display device comprises data sink 100, video/audio decoder 102, audio signal processor 104, loudspeaker 108, video signal preprocessor 106, display module 110, backlight 112, backlight driver 114, storage unit 116, illuminance transducer 118, picture level detecting device 120 and controller 122.
Data sink 100 receives from the data of external source input.For example, data sink 100 can receive audio/video signal, view data or will be by the data of any other type of display device output.
In some implementations; Data sink 100 can be the digital tuner of receiving digital broadcast signal, the analog tuner that receives analog broadcast signal, the digital external signal input terminal that is connected with external unit (for example, digital video disk (DVD) player, video game machine etc.) and input end of analog signal and digital VTR (such as personal video recorder (PVR) and digital video recorder (DVR)).Numeral external signal input terminal can be the input terminal that is used for the digital cable broadcast signal, or can connect the terminal of digital media player (such as DVD player).Simulation external signal input terminal can be the input terminal that can connect simulation media player (such as cartridge VTR (VCR)), or is used to simulate the input terminal of cable broadcasting signal.
In addition, can digital tuner be set to based on user's selection from a plurality of MPTSs that digital broadcast signal comprised of importing through the antenna that is used for digital broadcasting (TS, transmissionstream) in be tuned to the MPTS of desired channel.Can analog tuner be set to selection based on the user from a plurality of image programs that analog broadcast signal comprised of importing through the antenna that is used for analog broadcasting be tuned to the image programs of desired channel.
Therefore, the data that receive through data sink 100 can comprise analog television broadcast program and the digital broadcast program of real-time broadcasting, from playback of programs, program recording and the electrophone program of external played device input.When the data that receive comprised digital signal, these digital signals can comprise picture signal, voice signal and data-signal.When the data that receive comprised simulating signal, these simulating signals can comprise picture signal and voice signal.
Vision signal and sound signal in the data that 102 pairs of video/audio decoder receive through data sink 100 are decoded, and respectively decoded signal are sent to audio signal processor 104 and video signal preprocessor 106.
The sound signals that 104 pairs of audio signal processors send from video/audio decoder 102 are carried out signal Processing (such as digitizing, filtering etc.), and export the sound signal after the processing by loudspeaker 108.
The vision signals that 106 pairs of video signal preprocessors send from video/audio decoder 102 are carried out signal Processing (such as digitizing, filtering etc.), and come the vision signal after the display process by display module 110.
In some implementations, can video signal preprocessor 106 be arranged to comprise the picture level detecting device 120 of the average picture level (APL) of each frame that is used to detect input picture.In other implementation, picture level detecting device 120 is the unit that were arranged in 106 minutes with video signal preprocessor.
The APL of each frame of the view data that 120 pairs of picture level detecting devices are imported through data sink 100 measures, and the APL that measures is sent to controller 122.As more specifying after a while; A characteristics of image in a plurality of characteristics of image of APL and input image data is corresponding, and based on the picture level control of carrying out display device with the data of the corresponding backlight control value of illumination level, according to the APL that measures.
Display module 110 can comprise liquid crystal panel, data driver and gate driver; Liquid crystal panel comprises many select liness and a plurality of LCD transistor; Data driver drives many data lines according to video signal preprocessor 106 processed video signals, and gate driver receives drive signal and drives many select liness from timing controller.
Backlight 112 provide light to the front of liquid crystal panel.Backlight 112 can comprise and being installed into and overlapping a plurality of backlight of liquid crystal panel.
Backlight driver 114 provides drive current according to the register value that is sent by controller 122 to backlight 112.Liquid crystal panel can have a high image and wide light-emitting area.
Even when having shown picture signal through display module 110, if do not drive backlightly 112, then the user is difficult to see display module institute images displayed.In other words, when receive drive currents via backlight driver 114 backlight 112 when luminous, the user can more easily watch display module institute images displayed.
In addition, change through controller 122 and to offer backlight 112 driving current value, control the picture brightness of display module 110 thus, make whether according to the driving current value that offers backlight 112 be the brightness that height changes institute's picture displayed.
The various data that storage unit 116 has been stored the program relevant with the work of display device and in the course of work of display device, produced.In addition, storage unit 116 has been stored and the corresponding data that obtain of the product type information of display device.
Can generate the illumination level of measuring of each scheduled time slot to each illumination group, and it is stored in the storage unit 116.In addition, be stored in data in the storage unit 116 can comprise with the corresponding equation of each illumination group and/or with the register value of corresponding each APL of each illumination group.In addition, for the value that will unify dazzle value (UGR) is reduced to below the specified level, can be according to the illumination sense conditions, come the data of being stored in the storage unit 116 are generated and store based on the picture level of display device.
Above-mentioned equation uses average picture level as first variable, and this equation is to comprise as a of the coefficient of first variable with as the linear equation of the b of the constant of first variable.To separate the register value that (for example, second variable) is set at the picture level that is used to control display device through what this linear equation was obtained.In other words, be second specification of variables register value that is used to control backlight illumination.
Based on following content, obtain this linear equation: according to the illumination sense conditions with belong to same group the corresponding register value of maximum average picture level from a plurality of picture levels of display device; First coordinate information that comprises minimum average B configuration picture level value; With the corresponding register value of minimum average B configuration picture level; And second coordinate information that comprises the maximum image level value.To explain in more detail the process that obtains this equation after a while.
In addition; Can by can upgrade with the nonvolatile memory of deleted data (for example; Electrically Erasable Read Only Memory (EEPROM) and/or extending display identification data ROM (EDID ROM; Extended display identification data ROM)) realize storage unit 116, and storage unit 116 can be connected to controller 122 according to internal integrated circuit (I2C) scheme.
The illumination of the installation site of 118 pairs of display devices of illuminance transducer (for example, on every side) is carried out sensing.In other words, illuminance transducer 118 comprises and converts the light signal from display device exterior to electric signal and through measuring the optical sensor that these electric signal come the sensing external illuminance.
Controller 122 extracts the corresponding data of illumination sense conditions that sense with illuminance transducer 118 from storage unit 116.The register value of the picture level (for example, backlight illumination) that data that extract through use and picture level detecting device 120 detected APL are provided for controlling display device.
To explain in more detail the process of generation data and the work of controller 122 below.These data can be aforesaid equations (or result of equation) and/or can be the tables that has comprised applied register value.
Usually, use unified dazzle value (UGR) system to understand the dazzle standard of making us uncomfortable.The dazzle canonical representation that the UGR system will be made us uncomfortable usually is the value between 10 to 30.Along with the UGR value reduces, make us uncomfortable dazzle and also reduce, and along with the UGR value rises, making us uncomfortable dazzle also increases.In addition, can use UGR, can in pointolite, assess UGR through concentrating all light sources.
The fundamental equation of UGR is following.
[equation 1]
Wherein, Lb: the lightness of background [cd/m2]
Ls: the lightness of the luminous component of the light source in observer's sight line;
ω: the sterad of the luminous component of the light source in observer's sight line (steradian); And
P: the Guth location index of each light source.
Assess through equation 1 resulting UGR value according to the dazzle standard.The dazzle standard is as follows.
[table 1]
| General reaction | UGR |
| Just discover less than | 10 |
| Perceive | 16 |
| Can accept reluctantly | 19 |
| Unacceptable | 22 |
| Uncomfortable a little | 25 |
| Uncomfortable | 28 |
| Can't stand | 31 |
In other words, if the UGR value surpasses 10, then can make troubles or cause user's eye fatigue to the user.
Therefore, the present invention sets the picture level of display device according to ambient illuminance, and its target is the UGR value of from 9 to 10 (for example, less than 10).
For this reason, how to consider to change the UGR value accordingly with the illumination of the installed position of display device.In addition, if consider to change the UGR value, then can obtain the display device picture level Ls of UGR value between 9 to 10 according to ambient illuminance.
[table 2]
In other words, as shown in table 2 when ambient illuminance is 640, for the UGR value is set at 10.27, the image value of display device should be 276.
[equation 2]
ω=light-emitting area/(viewing distance * viewing distance)
[equation 3]
The p:Guth location index
d：R/H
s：T/H
R, H, T: referring to Fig. 4
In order to use equation 1 to obtain the UGR value, should use equation 2 and equation 3 to obtain ω value and p value.
The ω value can change with the model of display device.In other words, the ω value can change according to the inch information of display device, makes to obtain data according to the type information of display device.Below, be that example describes with 22 inches models.
When display device was 22 inches, light-emitting area was (0.43*0.27) cm
2In addition, the user's viewing distance is about 60cm generally, can obtain the ω value based on this distance.Yet the present invention is not limited to this, but can use other viewing distance.Therefore, when display device was 22 inches, the ω value was 0.3225.
In order to use equation 3 to confirm the p value, at first should obtain H value, T value and R value, as shown in Figure 4.
In some instances, become level with the user, make that H value and T value are 0 at the common center of watching the luminous zone of display device under the condition.Therefore, when H value and T value were 0, T/R shown in Figure 5 and H/R were 0 also, make that the p value is 1.
If in equation 1, use the above-mentioned ω value that obtains, p value and illumination level Lb value and target UGR value be used for the left side item of equation 1, then can calculate Ls value as the display device picture level.
Can use the above-mentioned display device picture level of obtaining continuously, still, in some instances, the illumination level of predetermined quantity is divided into one group, and obtain the data that are used for setting the display device picture level that to use by group.
For example, if 560 to 510 illumination level is divided into one group, the display device picture level that then will use is positioned at 244 to 224 scope.In other words, if the current ambient illuminance that senses is positioned at 560 to 510 scope, then the picture level of display device only changes in 224 to 244 scope.
The picture level of display device possibly not change in this scope randomly.In some instances, the APL value of the picture level of display device and input image data changes with being inversely proportional to.In these examples,, should obtain being used for setting accordingly the equation of display device picture level with the APL value in order to change the picture level of display device with the APL value with being inversely proportional to.
Simultaneously, the picture level of display device is the picture level that the picture level that is transmitted in fact outside the display device is restricted, thereby the picture level of display device can not be the data value that essence is used.The picture level of display device depends on brightness backlight.Therefore, there is the register value indicated with the corresponding backlight illumination of picture level of display device.The picture level and the relation between the register value of display device are as follows.
[table 3]
| | Lightness | |
| 255 | 244 | |
| 254 | 244 | |
| 253 | 242 | |
| 252 | 240 | |
| 251 | 238 | |
| 250 | 236 | |
| 249 | 234 | |
| 248 | 232 | |
| 247 | 230 | |
| 246 | 228 | |
| 245 | 226 | |
| 244 | 224 | |
| 243 | 222 |
In order to be set at 244 with the picture level of display device is as shown in table 3, should register value be set at 255 or 254.In addition, the register value backlight that is used to control display device is positioned at 0 to 255 scope, and when register value was set at 244, the picture level of display device was 224, and back facet current value corresponding with it is provided.Therefore, this equation is the equation that is used to obtain register value, wherein, has comprised the variable to the average picture level of input image data.
As shown in table 2, obtain display device picture level according to the illumination level application, then, the illumination level that will have preset range is divided into one group.For example, the illumination level with 560 to 510 is divided into one group, and 500 to 440 illumination level is divided into another group.
As stated, be divided into one group, then obtain organizing corresponding equation with each if will have the illumination level of preset range.For example, will be that 560 to 510 the first illumination level group describes to scope.Can use identical technology to confirm the equation of other illumination level group.
Under first group situation, the display device picture level that can show is positioned at 224 to 244 scope.In other words, be 550 o'clock at current illumination level, should in 224 to 244 scope, change to the display device picture level of this illumination level.
In some implementations, the picture level of display device and the APL of input image data change with being inversely proportional to.
In some implementations, only when known two or more coordinate figures, can obtain equation.Therefore, in these examples,, should obtain two coordinate figures in order to obtain and first group of corresponding equation.
In order to obtain coordinate figure, should known following content: belong to first group the corresponding register value of the maximal value with the display device picture level and with the corresponding register value of minimum value of display device picture level; And the maximum APL of input image data and minimum APL.
Usually the APL with input image data is expressed as 0 to 255 the scope that is positioned at.Yet, can not use the level indication that is positioned at 0 to 60 and 230 to 255 scopes, feasible picture level with display device is controlled at and only is positioned at 60 to 230 scope.
Therefore; The maximal value of the picture level of display device is 244, and the minimum value of the picture level of display device is 224, therefore; With the corresponding register value of the maximal value of display device picture level be 255, and with the corresponding register value of the minimum value of display device picture level be 244.In addition, maximum APL is 230, and minimum APL is 60.
In addition, as shown in Figure 6, the y axle is represented register value, and the x axle is represented the APL value, and wherein, these two values are inversely proportional to, and makes a coordinate figure be (60,255) and another coordinate figure is (230,244).
[equation 4]
y＝ax+b
In addition, because the general linear equation is identical with the equation shown in the equation 4, two coordinate figure substitution equations 4 that therefore will obtain respectively, thus obtain a value and b value.In this manner, first group equation is y=(11/170) x+258.88, and is as shown in Figure 6.
Can also obtain the equation of other group respectively according to identical mode.For example, be illustrated in figure 7 as at coordinate figure under the situation of (60,149) and (230,125), obtain equation y=(11/170) x+123.88.
[table 4]
Through above method, can obtain and the corresponding equation of the model name of each display device, shown in the example in the table 4.
Therefore, controller 122 extracts the corresponding equation of illumination sense conditions that senses with illuminance transducer 118 from storage unit 116.
The APL that controller 122 uses the equation that extracts to come application register value and picture level detecting device 120 to measure, and control the picture level of display device through using this register value.
In other implementation, controller 122 employed data can be the brilliance control tables that comprises the essence register value.In addition, the brilliance control table basis illumination group similar with equation exists.
The brilliance control table of having used when for example, storage unit 116 has been stored brilliance control table, the brilliance control table of using when illumination is 0 to 100Lux around of using when illumination is 101 to 200Lux around respectively and illumination is 201 to 300Lux around.
In other words, as shown in Figure 8, storage unit 116 has the corresponding bright control table of using according to the illumination around the current installation site of display device.The brilliance control table comprises and average picture level relevant register value.In other example, storage unit 116 has only been stored and the corresponding certain luminance control table of benchmark illumination, and uses this certain luminance table to generate and the corresponding brilliance control table of another illumination.
Controller 122 extracts the corresponding brilliance control table of the illumination sense conditions that senses with illuminance transducer 118 from storage unit 116, and uses the brilliance control table and the detected APL that extract to set the register value that is used to control brightness backlight.
Controller 122 also (for example, constantly) to counting service time backlight, and is stored in it in storage unit 116.Controller 122 is according to coming optionally to change the register value of setting with corresponding mode service time backlight of being stored.For example, backlight 112 for as consumables, if exceeded the schedule time, the brightness meeting of the light that is then produced changes service time.In other words, brightness backlight is along with the increase of service time and reduce.
As shown in Figure 9, the life-span backlight is about 50000 hours,, is then using under the situation of same register value the brightness when brightness backlight is reduced to initial purchase only about half of if exceeded 50000 hours service time backlight.Therefore, if exceeded the schedule time service time backlight, then controller 122 with increase the register value that sets service time backlight with being directly proportional.
For example, if the register value of confirming be 200 and exceeded the schedule time service time backlight, then the register value that sets is increased predetermined extent (for example, 10).Suppose when the initial purchase display device, register value to be set at 255; And be 244 with brightness settings backlight, and under the situation that has exceeded the schedule time service time backlight, register value is set at 270, and is 244 brightness settings backlight; So; In order to be 244 with brightness settings backlight, controller is not set at 255 with register value, is 270 but be set.Therefore, display device descends to the brightness of the output picture that causes owing to service time backlight and has made compensation, and making to provide image frame stable or high image quality to the user at the whole life period of display device.
The APL of 122 pairs of picture level detecting device 120 detected each frames of controller checks, and the APL between each frame changes when exceeding predetermined extent optionally control register value.For example; When the APL of the view data that receives becomes n-＞m or m-＞n suddenly; If under situation about having set with the corresponding register value of n, register value is changed into the corresponding register value with m, then may produce and the corresponding picture noise phenomenon of jump in brightness backlight.Therefore, if detected interframe APL changes and to have exceeded predetermined extent, then controller 122 is divided into predetermined step level (step) with the region of variation of APL, and according to the corresponding APL that is divided application register value successively step by step.
For example, shown in figure 10, be 50 and the APL of present frame is 120 o'clock at the APL of former frame, APL is changed to 70.In addition, if the variation of APL surpasses 50, then above-mentioned noise phenomenon possibly appear.Therefore, because APL variation in this example is 70, therefore the region of variation with APL is divided into predetermined step level.Like this, the region of variation of APL is 50 to 120, and area dividing that will from 50 to 120 becomes predetermined step level.The quantity of the step level that in addition, can confirm to be divided based on user preference and the distance between each step level (for example, equidistance etc.).In this example, region of variation is divided into four step levels.
As shown in the figure, if region of variation is divided into four step levels, then APL becomes 75 in first step level, and APL becomes 90 in the second step level, and APL becomes 105 in the 3rd step level, and APL becomes 120 in the 4th step level.With the corresponding register value of first step level be b, with the corresponding register value of the second step level be c, with the corresponding register value of the 3rd step level be d, and with the corresponding register value of the 4th step level be e.Therefore, though the register value of setting before is that " a " and the current register value that will set are " e ", in turn applicable value b, c, d, e, rather than direct applicable value e.This can make the user be difficult for perceiving the variation (for example, noise) of backlight illumination.
Change brightness backlight according to the brightness around the installation site of display device and the luminance level of input image data; Make and to reduce, and can reduce power consumption significantly according to offering change in current backlight owing to the eyes of user of watching display device to cause continuously is tired.
In addition, the backlight illumination that changed the service time according to display device compensates, and making to provide image frame stable or high image quality to the user.
And, change applied backlight illumination according to the variation of the luminance level of input image data, make and can reduce the noise phenomenon that the jump in brightness according to view data produces.
Figure 11 shows the illustrative methods of control display device.At first, to each illumination level, generate and store make the UGR value be lower than predeterminated level, with the corresponding data of picture level (S101) of display device.These data are used for controlling brightness backlight according to APL.These data can comprise aforesaid equation and/or aforesaid brilliance control table.To confirm that to being used for the illustrative methods of this equation describes with reference to Figure 11.In the above method that is used for confirming this equation of also having described in to the explanation of equipment.
Illumination to around the installation site of display device is carried out sensing (S 102).Can come the sensing ambient illuminance continuously or according to one or more predetermined space.For example, the illumination around the installation site of 118 pairs of display devices of illuminance transducer is carried out sensing, and will send controller 122 to the corresponding sensing result information of the ambient illuminance that senses.
Extracting data in storage goes out and the corresponding data of ambient illuminance (S103) that sense.For example, controller 122 receives the sensing result information by illuminance transducer 118 outputs, and the corresponding data of sensing result information that extract and receive from storage unit 116.
Average picture level to input image data detects (S104).Can detect average picture level continuously or according to one or more predetermined space.For example, the APL of 120 pairs of input image datas of picture level detecting device detects, and detected APL is outputed to controller 122.
Controller 122 uses the data and the detected APL that extract to set the register value (S105) of controlling backlight illumination.For example, controller 122 uses detected APL in above-mentioned equation, can confirm register value thus.In addition, controller 122 can extract from the brilliance control table that extracts and the corresponding register value of detected APL.
Controller 122 uses the register value of setting to control brightness backlight (S106).For example, the register value that controller 122 is set to backlight driver 114 outputs, and backlight driver 114 provides and the corresponding drive current of being exported of register value to backlight 112.
Figure 12 shows the illustrative methods that obtains equation.At first, obtain making the UGR value to be lower than display device picture level (S201) predeterminated level, that be directed against each illumination level.Illumination level in the preset range is divided into a group (S202).Corresponding to a plurality of different illumination level scopes, a plurality of groups of can confirm illumination level.
Confirm the maximal value and the minimum value (S203) of the display device picture level of existence in each group.Maximal value and the minimum value (S204) of the APL that also confirms to show according to input image data.
Confirm and the corresponding register value of determined display device picture level maximal value, and confirm and the determined corresponding register value of display device picture level minimum value (S205).Confirm to have comprised first coordinate information with corresponding register value of this maximal value and minimum APL, and confirm to have comprised second coordinate information (S206) with corresponding register value of this minimum value and maximum APL.Use determined first coordinate information and second coordinate information to obtain corresponding with it equation (S207).Can use with above and obtain this equation with reference to the technological similar techniques that Fig. 6 and Fig. 7 discussed.
Figure 13 shows the illustrative methods that changes register value.At first, set and the corresponding register value of the APL of input image data (S301) through said method.
Controller 122 is stored in the service time backlight in the storage unit 116 before confirming
(S302)。Can confirm service time continuously or according to one or more predetermined space.For example, can periodically check and upgrade service time backlight.
Controller 122 compares determined service time backlight and Preset Time, judges whether exceeded Preset Time (S303) service time backlight thus.If exceeded Preset Time service time backlight, then controller 122 is based on increasing the register value (S304) that sets service time.For example, brightness backlight is corresponding to service time and reduce, thereby controller 122 is according to the determined register value that changes setting service time.According to reply because the mode of the backlight illumination reduction that the process of time produces increases the register value of setting.
Controller 122 is controlled brightness backlight (S305) through (for example, increase) register value of using after changing.
If do not exceed the schedule time service time backlight, then controller 122 is controlled brightness backlight (S306) through the register value of application settings.For example, before the brightness that reduces exceeded threshold value, controller 122 does not consider because the backlight illumination reduction that the process of time produces.
Figure 14 shows the illustrative methods of application register value.As shown in the figure, controller 122 is set the register value (S401) that is used to control backlight illumination through said method, and correspondingly calculate the APL corresponding with present frame and with the corresponding APL of former frame between difference (S402).
In addition, controller 122 confirms whether the APL difference that calculates has exceeded predetermined value (S403).If the APL difference that calculates has exceeded predetermined value, then controller 122 is divided into predetermined step level with the region of variation of APL.For example, shown in figure 10, APL that will be corresponding and the step level that becomes to be scheduled to area dividing between the corresponding APL of present frame with former frame.Controller 122 is used and the relevant APL relevant register value (S405) of being divided step by step successively.
If the APL difference that calculates does not exceed predetermined value, then controller 122 is controlled brightness backlight (S406) through the register value of direct application settings.Like this, when APL does not occur not suddenling change more significantly, because the user unlikely perceives the noise that produces owing to this variation, so the direct register value of application settings.
Should be understood that, under the situation of spirit that does not break away from claim and scope, can make various modifications.For example, if, still can realize favourable effect if carry out the step of disclosed technology and/or make up the parts in the disclosed system and/or replace or replenish by other parts according to different modes according to different order.Therefore, other implementation falls into the scope of accompanying claims.
The cross reference of related application
The right of priority of korean patent application No.10-2008-0053994 that the application requires to submit on June 10th, 2008 and the korean patent application No.10-2009-0004967 that submits on January 21st, 2009 is incorporated its full content into the mode of quoting as proof here.
Claims (15)
1. display device, this display device comprises:
Illuminance transducer, this illuminance transducer are configured to the illumination around the installation site of said display device is carried out sensing;
Viewdata receiver, this viewdata receiver are configured to receive picture signal to be shown;
The picture level detecting device, this picture level detecting device is configured to detect and export the average picture level of the signal that is received by said viewdata receiver; And
Controller, this controller are configured to control the backlight brightness relevant with said display device based on the said average picture level that the said illumination that is sensed by said illuminance transducer and said picture level detecting device are exported,
Wherein, said controller is configured to through following processing, and the intensity of variation of the said average picture level of being exported based on said picture level detecting device is controlled the said backlight brightness relevant with said display device:
Confirm the intensity of variation of the said average picture level that said picture level detecting device is exported;
The intensity of variation and the preset level of said average picture level are compared;
Judge relatively based on said whether the intensity of variation of said average picture level has exceeded said preset level; And
In response to the intensity of variation of said average picture level has exceeded the judgement of said preset level the period of change of said average picture level is divided into a plurality of steps levels and grade in turn regulates the said backlight brightness relevant with said display device according to the said step.
2. display device according to claim 1, this display device also comprises:
Storage unit, this storage unit be configured to store with corresponding to the relevant data of the backlight control value of illumination level,
Wherein, Said controller is configured to the corresponding data of illumination level that sense through from said memory unit access and said illuminance transducer; And use the data visited and the said average picture level of said picture level detecting device output to set at least one register value that said brightness backlight is controlled, thereby control the said backlight brightness relevant with said display device based on the said average picture level of said illumination that senses by said illuminance transducer and the output of said picture level detecting device.
3. display device according to claim 2; Wherein, Come said illumination level is divided into groups to each preset range in a plurality of preset ranges; And, be stored in the said storage unit said with comprise corresponding to the relevant data of the backlight control value of illumination level and the corresponding equation of each illumination group.
4. display device according to claim 3; Wherein, Said is to have the average picture level as independent variable, the coefficient that is directed against said independent variable and the linear equation of constant with the corresponding equation of each illumination group; And the said average picture level that said controller is configured to use said picture level detecting device to be exported is set said at least one register value for the result of said equation.
5. display device according to claim 2; Wherein, Come said illumination level is divided into groups to each preset range in a plurality of preset ranges; And, be stored in the said storage unit said with corresponding to the relevant data of the backlight control value of illumination level be to the register value of corresponding each average picture level of each illumination group.
6. display device according to claim 2, wherein, based on to the said illumination that senses by said illuminance transducer, will unify the picture level that the dazzle value is reduced to said display device required below the specified level, confirm said register value.
7. display device according to claim 2, wherein, said register value and said average picture level are inversely proportional to.
8. display device according to claim 1, wherein, said controller also is configured to control the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight.
9. display device according to claim 8; Wherein, Said controller also is configured to through confirming the said time quantum that has been used backlight and according to the corresponding mode of the determined said time quantum that has been used backlight at least one set-up register value of controlling said brightness backlight being regulated, thereby controls the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight.
10. method of controlling display device, this method may further comprise the steps:
By illuminance transducer the illumination around the installation site of said display device is carried out sensing;
Receive picture signal to be shown;
The average picture level of the signal that detection receives; And
Control the backlight brightness relevant by controller based on detected average picture level and by the said illumination that said illuminance transducer senses with said display device,
Wherein, said control comprises:
Confirm the intensity of variation of the said average picture level that the picture level detecting device is exported;
The intensity of variation and the preset level of said average picture level are compared;
Judge relatively based on said whether the intensity of variation of said average picture level has exceeded said preset level; And
In response to the intensity of variation of said average picture level has exceeded the judgement of said preset level the period of change of said average picture level is divided into a plurality of steps levels and grade in turn regulates the said backlight brightness relevant with said display device according to the said step.
11. the method for control display device according to claim 10, this method is further comprising the steps of:
In storage unit the storage with corresponding to the relevant data of the backlight control value of illumination level,
Wherein, may further comprise the steps based on detected average picture level and by the step that the said illumination that said illuminance transducer senses is controlled the backlight brightness relevant with said display device by said controller:
The corresponding data of illumination level that sense from said memory unit access and said illuminance transducer, and use the data and the detected average picture level of being visited to set at least one register value that said brightness backlight is controlled.
12. the method for control display device according to claim 11, wherein, storage may further comprise the steps with step corresponding to the relevant data of the backlight control value of illumination level in said storage unit:
Come said illumination level is divided into groups to each scope in a plurality of scopes, and storage and the corresponding equation of each illumination group.
13. the method for control display device according to claim 11, wherein, storage may further comprise the steps with step corresponding to the relevant data of the backlight control value of illumination level in said storage unit:
Come said illumination level is divided into groups to each scope in a plurality of scopes, and store the register value that is directed against with corresponding each average picture level of each illumination group.
14. the method for control display device according to claim 10; Wherein, may further comprise the steps based on detected average picture level and by the step that the said illumination that said illuminance transducer senses is controlled the backlight brightness relevant with said display device by said controller:
Control the said backlight brightness relevant based on the said time quantum that has been used backlight with said display device.
15. the method for control display device according to claim 14, wherein, the step of controlling the said backlight brightness relevant with said display device based on the said time quantum that has been used backlight may further comprise the steps:
Confirm the said time quantum that has been used backlight; And
According to coming at least one set-up register value of controlling said brightness backlight is regulated with the corresponding mode of the determined said time quantum that has been used backlight.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020090004967A KR101149216B1 (en) | 2009-01-21 | 2009-01-21 | Display apparatus and control method thereof |
| KR10-2009-0004967 | 2009-01-21 |
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| KR101109447B1 (en) * | 2011-03-04 | 2012-01-31 | 삼성탈레스 주식회사 | Apparatus and method for controlling auto brightness |
| KR101778997B1 (en) * | 2011-05-02 | 2017-09-18 | 엘지전자 주식회사 | Mobile Terminal And Method Of Controlling The Same |
| KR102081931B1 (en) * | 2013-06-19 | 2020-02-26 | 엘지전자 주식회사 | Foldable display device and method for controlling thereof |
| CN105070251A (en) * | 2015-07-22 | 2015-11-18 | Tcl海外电子（惠州）有限公司 | Backlight control method and device |
| CN111210777A (en) * | 2018-11-21 | 2020-05-29 | 北京小米移动软件有限公司 | Backlight brightness adjusting method and device, electronic equipment and machine-readable storage medium |
| CN115119035B (en) * | 2021-03-23 | 2023-08-01 | 青岛海信商用显示股份有限公司 | Display device, image processing method and device |
| KR20230060335A (en) * | 2021-10-27 | 2023-05-04 | 삼성전자주식회사 | Server and controlling method thereof |
| CN114420071B (en) * | 2022-01-28 | 2023-08-25 | Oppo广东移动通信有限公司 | Brightness calibration method, brightness calibration device, electronic equipment and storage medium |
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| CN1904990A (en) * | 2005-07-27 | 2007-01-31 | 株式会社东芝 | Display apparatus and method of controlling the backlight provided in the display apparatus |
| US20070115302A1 (en) * | 2005-11-24 | 2007-05-24 | Jih-Fon Huang | Method and structure for automatic adjusting brightness and display apparatus |
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| JPH06303551A (en) * | 1993-04-12 | 1994-10-28 | Victor Co Of Japan Ltd | Television receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101203797A (en) * | 2005-06-24 | 2008-06-18 | 株式会社小松制作所 | Liquid crystal display |
| CN1904990A (en) * | 2005-07-27 | 2007-01-31 | 株式会社东芝 | Display apparatus and method of controlling the backlight provided in the display apparatus |
| CN101305414A (en) * | 2005-11-11 | 2008-11-12 | 夏普株式会社 | Liquid crystal display device |
| US20070115302A1 (en) * | 2005-11-24 | 2007-05-24 | Jih-Fon Huang | Method and structure for automatic adjusting brightness and display apparatus |
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| KR20100085588A (en) | 2010-07-29 |
| CN101783115A (en) | 2010-07-21 |
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