CN102610197B - Adjustment of intensity level of lateral luminous type back light display device - Google Patents
Adjustment of intensity level of lateral luminous type back light display device Download PDFInfo
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Abstract
The invention discloses a method, system and device for adjusting intensity level of at least one luminous body on a lateral luminous type back light of a display device. In a specific embodiment, one or more values representing light diffusion distribution of a specific luminous body is stored. At least partly according to the stored value, the invention can adjust the intensity level of the luminous body by adjusting one or more brightness values relative to the specific luminous body.
Description
The application is U.S. Patent application 12/748, the 222 (applying date: part continuity application case on March 26th, 2010), it is incorporated into the application by reference.
[technical field]
Theme of the present invention relates to method, the system or equipment of adjusting the intensity level of at least one luminophor on display device side direction light emitting type backlight.
[background technology]
The lateral direction light emission formula light source for example can be used as, in display device (, televisor, portable equipment, computer equipment or similar devices) backlight.Although for some equipment or some indicating characteristic, the meeting backlight of lateral direction light emission formula is suitable, still also has the challenge on some lateral direction light emission formulas display characteristic backlight.For instance, the light distribution characteristics of the luminophor on lateral direction light emission formula is backlight can affect the image display feature of equipment, and perhaps this be that beholder is undesired.
Therefore, continual exploitation just necessitates for the method or the technology that alleviate negative display characteristic or improvement image quality.
[summary of the invention]
The present invention discloses method, system or the device of the intensity level of adjusting at least one luminophor on display device side direction light emitting type backlight.In a particular embodiment, the one or more values that represent the light diffusion profile of specific luminophor of access.At least in part according to described access value, the present invention can be by adjusting one or more brightness values that be associated with this specific luminophor, and adjust the brightness of specific luminophor.
Advantage of the present invention is that power saving and heat management are improved.In addition, exemplary advantage also comprises improvable contrast or colouristic properties ratio, and halation phenomenon can be alleviated, and this is also another advantage.
[accompanying drawing explanation]
In claim part, can particularly point out and clearly advocate subject matter of the present invention.Yet, by with reference to by reference to the accompanying drawings, and following embodiment, can understand better structure and the How It Works of advocated subject matter, together with its target, feature and advantage, in accompanying drawing:
Fig. 1 is the embodiment schematic diagram of exemplary display devices of describing to adjust the intensity level of at least one luminophor on display device side direction light emitting type backlight.
Fig. 2 describes for adjusting the embodiment process flow diagram of illustrative methods of the intensity level of at least one luminophor on display device side direction light emitting type backlight.
Fig. 3 A-3D shows the exemplary techniques of one or more typical values of determining the light diffusion profile of a luminophor on display device side direction light emitting type backlight according to one or more embodiment.
Fig. 4 A and 4B show according to matrix and the chart of the example typical value of the light diffusion profile of a luminophor on one or more embodiment display device side direction light emitting type backlights.
Fig. 5 shows according to one or more embodiment for adjusting the exemplary light diffusion profile weighting function of at least one the luminophor intensity level on display device side direction light emitting type backlight.
Fig. 6 shows according to one or more embodiment exemplary time filtering.
Fig. 7 shows according to the various intensity levels of luminophor at least part of on one or more embodiment exemplary display screens edge.
Fig. 8 A-8C shows the example values being associated with at least one luminophor intensity level on adjustment display device side direction light emitting type backlight according to one or more embodiment.
[embodiment]
In following embodiment, will numerous details be described so that the thorough understanding to advocated subject matter to be provided.Yet, those skilled in the art will appreciate that there is no, under the situation of these details, also can to put into practice advocated subject matter.In other situation, for unlikely, make advocated subject matter smudgy, by the method, equipment or the system that are not described in detail one of ordinary skill in the art and know.
As mentioned above, the lateral direction light emission formula light source for example can be used as, in display device (, televisor, portable equipment, computer equipment or similar devices) backlight.In this context, lateral direction light emission formula is backlight comprises that one is backlight, and wherein these one or more luminophors backlight are positioned near one or more edges at least partly, as the level of display device and/or vertical edge.
As mentioned before, a potential challenge of the display characteristic of local shading (local dimming) lateral direction light emission formula display device is, one or more luminophors may have can affect the light distribution characteristics of this device image display feature, and that these are users is undesired.For example, the luminophor being positioned at least partly on display device one edge may distribute light in unconventional mode.
For example, the display screen 300 in Fig. 3 has been described the exemplary light distribution property of luminophor 301, and luminophor 301 is that the part of lateral direction light emission formula display device is backlight.From screen 300, can see, about a part 302 of display screen 300 (part 302 representing as dotted line), the light of luminophor 301 is diffusion patterned can be described as asymmetric shape.For example, the light that luminophor 301 sends does not concentrate on part 302 center in vertical direction, and this is only an example.Similarly, can also know from screen 300, the light diffusion profile of luminophor 301 may have fewer optical crosstalk with adjacent part (not shown), around the top horizontal edge of screen 300; On the contrary, the light diffusion profile of luminophor 301 has more and crosstalks at screen 300 centers.
These and other light distribution property, describes in Fig. 3 C as those, can cause some negative indicating characteristic.For LCD display device (being only an example), the some diffusion profile of luminophor is larger on the impact of LCD pixel.Thereby LCD pixel value can affect the numerical value of a plurality of luminophors and determine.Lateral direction light emission formula these features backlight can affect the display characteristic of LCD display.Only as an example, if do not obtain one or more numerical value of suitable luminophor, these features can cause, for specific beholder, partial display image is too dark or too bright, particularly when beholder watches the image on screen under specific environment light condition.
Except above these, also have some other negative indicating characteristic relevant to the light distribution characteristics of lateral direction light emission formula display device.Some exemplary negative indicating characteristics comprise so-called " halation " problem, static or the dynamic halation that for example user can see, or so-called " flicker " problem, for example, when backlight intensity obtains too soon about demonstration image change, just can cause flicker problem, these are all some examples.
Based on these and other, consider, according to some aspect of this description, exemplary embodiment can comprise for adjusting method, the system or equipment of the intensity level of the lateral direction light emission formula of display device at least one luminophor on backlight.For instance, in certain embodiments, the intensity level of adjusting at least one luminophor comprises:
In this literary composition, " brightness " of luminophor or " intensity level " available cd/m
2for measuring unit represents, " brightness " or " intensity level " can corresponding one or more intensity, and it is relevant to the signal value of the brightness of one or more control luminophor and color.Therefore, in certain embodiments, adjusting the intensity that intensity level can comprise that adjustment is relevant to one or more these signal values, is only an example.
Fig. 1 is the schematic diagram of the embodiment 100 of exemplary display devices 110, and described display device can be adjusted the intensity level of the lateral direction light emission formula of display device at least one luminophor backlight.Herein, for instance, display device 110 can comprise arbitrary display device, for example televisor, handheld apparatus, computer installation or similar device (as non-limitative example).It should be noted that for graphic extension object, embodiment 100 has described the display device 110 of simplifying.Therefore,, in order not obscure advocated subject matter, display device 110 can comprise numerous assemblies of not describing in embodiment 100, device etc.Therefore, display device 110 can comprise one or more image processors, diffuser plate, driver, microcontroller, microprocessor, storer, bus, sensor, wave filter or other assembly or device (as non-limitative example).Certainly, the many assemblies in these assemblies that are omitted or device or device can be integrally or are partly carried out one or more functions in function described herein.
It is backlight 120 that display device 110 has lateral direction light emission formula, and it comprises that a plurality of luminous body positions are in the edge of this display device.In this article, mean can radiative object for luminophor.For instance, can comprise light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), surface conductive electronic emitter display (SED), Field Emission Display (FED) or similar device (as non-limitative example) to lateral direction light emission formula 120 relevant luminophors backlight.Therefore, in certain embodiments, lateral direction light emission formula backlight 120 can comprise that a plurality of LED's of being placed in or being placed at least partly on one or more edges is backlight.In certain embodiments, LED can have a plurality of color channels (only as an example).Here note that lateral direction light emission formula backlight 120 is described as a plurality of luminophors on two horizontal edges that are placed in display device.This description is in order to simplify object, so claim scope is not so limited.Therefore,, only as an example, lateral direction light emission formula is backlight can one or more luminophors, is placed at least partly any place at one or more edges of display device.
Display device 110 has liquid crystal display (LCD) panel 130.In specific embodiments, LCD can adopt the lateral direction light emission formula light that produces backlight, because LCD can not produce light conventionally.Therefore,, in display device 110, lateral direction light emission formula backlight 120 is connected with LCD panel 130.In embodiment 100, lateral direction light emission formula backlight 120 is sent light, and some of them light can arrive beholder's eyes through LCD panel 130, as the direction arrow in Fig. 1 is described.
In embodiment 100, control circuit 140 can comprise microcontroller, microprocessor, integrated chip (IC) and/or similar device (as non-limitative example).As above proposed, control circuit 140 is to be electrically connected to lateral direction light emission formula backlight 120 and LCD panel 130.In embodiment 100, for instance, control circuit 140 can receive one or more received image signal values, and for example image input signal value 150.In certain embodiments, for instance, image input signal value 150 can comprise the binary digital signal that represents one or more images (for example one or more picture frames).Therefore, image input signal value 150 can comprise the image signal value in image processing process, its at least in part respective side to brightness or the intensity level (only as an example) of one or more luminophors of light emitting type backlight 120.
In embodiment 100, display device 110 has ambient light sensor 160.Ambient light sensor 160 can comprise can measurement, sensing or otherwise determine any device or the assembly of one or more ambient light value of display device 110.For instance, ambient light sensor 160 can comprise one or more photodiodes, photo-resistor and/or phototransistor (as non-limitative example).As some non-limitative examples, the ambient light value of display device can be expressed as amount or the intensity of the lip-deep light of at least a portion that is incident on display device, or amount or the intensity (for example ambient lighting conditions) of display device light around, take Lux (lux) as measuring unit (only as an example).For instance, ambient light sensor 160 can be U.S. Patent application 12/748,222 (the applyings date: on March 26th, 2010, applicant: Zhang Wei, title: the type of describing Adjusting a Brightness Level of aDisplay Device).Certainly, but it should be noted that claim is not limited to arbitrary specific sensor type, method or the technology for sensing herein, and sensing is also not limited to specific environment or condition in space or on the time.
As mentioned above, in certain embodiments, control circuit 140 is the numerical value based on representing the light diffusion profile of specific luminophor at least in part, adjusts the intensity level of the specific luminophor in lateral direction light emission formula backlight 120.For instance, in certain embodiments, control circuit 140 can the specific luminophor of the one or more expressions of access the numerical value of light diffusion profile, the one or more image feature values of filtering, as one or more image input signal values, image subdivision typical value, weighting brightness value or other image values, they can represent input picture value or parts of images feature by least one light diffusion profile weighting function.And, in certain embodiments, control circuit 140 is the image input signal value based on one or more processing and definite luminophor brightness value at least in part, adjusts one or more pixel values, as red, the green or blue pixel value of LCD panel 130, it is only an example.In order to carry out one or more this operations, control circuit 140 can utilize herein (for example, in Fig. 2) described one or more methods or technology.Certainly, as previously mentioned, although one or more processes that Fig. 2 describes or operation can be carried out by control circuit (as control circuit 140), in certain embodiments, one or more these class processes or operation can integrally or partly be carried out via various assemblies or device.Therefore, the scope of the invention is not limited to example or explanation.
Fig. 2 describes for adjusting the embodiment 200 of illustrative methods of the intensity level of the lateral direction light emission formula of display device at least one luminophor on backlight.At piece 210 places, process, system or equipment can the one or more image input signal values of access, as image input signal value 150.Here, image input signal value can comprise the binary digital signal that represents one or more images (as one or more picture frames of one or more different color channels), if by processing, so described binary digital signal is brightness or the intensity level (only as an example) of corresponding one or more luminophors at least in part.
As above proposed, at piece 220 places, process, system or equipment can be processed one or more image input signal values to produce one or more image feature values.In embodiment 200, only as an example, the one or more image feature value can comprise one or more image subdivision typical values.But in other embodiments, can comprise can be by the intensity level of various technical finesses for one or more image feature values.Therefore, the present invention is not limited in this respect.
Owing to existing the whole bag of tricks to go to produce one or more subdivision typical values, it is unpractical therefore listing all these class methods.Then, should note, although the invention is not restricted to arbitrary particular technology or method for piece 220, but there is a kind of exemplary method to use, if the title of filing an application on September 23rd, 2009 is " Method, system or apparatus for adjusting a brightness level associated with at least a portion of a backlight of a display device is (for adjusting the method for display device at least a portion intensity level backlight, system or equipment) " sequence number is 12/565, a kind of technology of describing in 635 U.S. patent application case.The simplification narration of this technology will be in following description.
According to patent application case referred to above, for example, can image information (as picture frame) be cut apart, separately or be otherwise divided into a plurality of image sections by control circuit.These image sections further can be divided into a plurality of image subdivisions from one or more image sections.For one or more these image subdivisions, can determine corresponding represent signal values.Description in patent application case as mentioned above, represent signal values can comprise one or more numerical value of the image property of presentation video subdivision, as intensity, brightness, peak value or average brightness value, peak value or average color channel value or similar value, be only several examples.In order to illustrate, lexical or textual analysis patent application case referred to above, can be by being used the peak value sub-pixel signal value of specific image subdivision (as Peak
i=Max (R
i, G
i, B
i)) select represent signal values.Herein, sub-pixel value can comprise intensity or the brightness value R of the redness, green and the blue color channel that represent respectively specific image subdivision
i, G
i, B
i, be only an example.Therefore, in certain embodiments, the typical value of specific image subdivision can be confirmed as: the Max (Peak of typical value=image subdivision
ij).Herein, subscript " ij " can be indicated the specific pixel location in image subdivision, as used cartesian coordinate system identification to be positioned at the specific pixel at row i, row j place, is only an example.But it should be noted that said method only shows that an exemplary method goes to process one or more image input signal values to produce one or more subdivision typical values, therefore, the scope of the invention is not limited to any adhoc approach.
As described in more detail below, according to one or more subdivision typical values, can process these image input signal values and produce one or more luminophor brightness values of luminophor.In certain embodiments, by one or more smooth diffusion profile weighting functions and/or one or more function of time, can the one or more subdivision typical values of filtering.
In this literary composition, light diffusion profile weighting function comprises the function applicable to one or more image feature values (as one or more image subdivision typical values).Light diffusion profile weighting function represents the one or more specific light diffusion profile of one or more specific luminophors.In this literary composition, for one or more specific luminophors, the function of time comprises applicable to one or more preliminary definite luminophor intensity levels of present frame and the function of at least one previous signal controlling value.Light diffusion profile weighting function and the function of time will described below in more detail.
In addition, in certain embodiments, can use one or more local shading manipulation technologies further to process one or more image input signal values or other values.In certain embodiments, can, according to corresponding one or more signal values of one or more luminophors, carry out the processing of using one or more local shading manipulation technologies, as described in more detail below.In certain embodiments, one or more image input signal values of processing by one or more local shading manipulation technologies can be applied to the LCD panel (in certain embodiments) of described display device.
At piece 230 places, process, system or equipment can be at least in part based on one or more numerical value and/or one or more ambient light value or its combined values that represent one or more smooth diffusion profile, and determine one or more smooth diffusion profile weighting functions.
As described above, process, system or equipment can be at least in part based on one or more numerical value that represents one or more smooth diffusion profile, and determine one or more smooth diffusion profile weighting functions.For illustrating, referring again to Fig. 3 C, suppose that luminophor 301 is relevant with specific luminophor brightness value, this is only an example.Here, process, system or equipment can the one or more numerical value that represents one or more smooth diffusion profile of luminophor 301 of access, to confirm the light spread function of luminophor 301.These numerical value that represent the light diffusion profile of luminophor 301 are depicted as chart, as the exemplary light diffusion profile weighting function 401 in Fig. 4 B.These numerical value can pre-determine and be stored in (not shown) in device memory.
But, in certain embodiments, can determine one or more smooth diffusion profile weighting functions.Because exist the whole bag of tricks to go to determine one or more smooth diffusion profile weighting functions, so will list all methods, be unpractiaca.Therefore, note that the present invention is not limited to any particular technology or method for piece 230, below can describe an illustrative methods.
In order to determine an exemplary light diffusion profile weighting function, please refer to Fig. 3 A.Here, Fig. 3 A has shown that the luminescent image intensity of exemplary luminophor 301 is at the center of display device.Herein, for example redness represents higher cd/m
2value, on the contrary, the lower cd/m of blue expression
2value.Fig. 3 A has shown when the light transmission diffuser plate (not shown) that luminophor 301 sends and the exemplary light intensity after LCD panel.
At Fig. 3 B, process, system and/or equipment can be converted to image display size territory (display dimension domain).For instance, for convenience of explanation, the display sizes of supposing Fig. 3 B is 1920 * 1080 pixels.Coordinate and light intensity based on showing, process, system and/or equipment can be converted to image 1920 * 1080 size, and its display size of describing with Fig. 3 B is consistent.
Then, at Fig. 3 C, process, system and/or equipment, in order to simplify calculating, can be determined an intercepting region, as 10% intercepting district of part 302 demonstrations.In this example, when having determined the preliminary intensity level of corresponding LED, part 302 is considered image areas.Certainly, it should be noted that in other embodiments there is no this intercepting, in addition, this intercepting can be used various sizes size, and the 10% intercepting district that can show than part 302 is larger or less.The invention is not restricted in this respect.
Then, as Fig. 3 D, process, system and/or equipment can be divided into part 302 subimage block of a plurality of i * j.In Fig. 3 D, subimage block 303 is 60 * 60 pixels, and this is only an example.In certain embodiments, the size of subimage block can with determine the measure-alike of relevant image subdivision to typical value.Namely, the size of the subimage block of building for light diffusion profile weighting table lattice, can be with consistent for the size of the definite image subdivision of typical value.Certainly, in certain embodiments, the size of the size of subimage block and the subdivision calculated for typical value can be different.So the present invention is not limited.
Continue this and describe, in Fig. 3 D, process, system and/or equipment can be added the light diffusion strength value in these subimage blocks, and one or more subimage blocks of part 302 are determined to an intensity Wij.In this way, can determine the Wij of each subimage block and be stored in (not shown) in the storer of display device.
Fig. 4 A shows an exemplary light diffusion profile weight function matrix.Determined (as based on the above method and definite) one or more Wij can normalization (normalized) and for building the light diffusion profile weight function matrix as Fig. 4 A.For example, Wij value can build such matrix, and the sequential value of subimage block in the vertical direction is I, and the sequential value in subimage block horizontal direction is J.
Fig. 4 B diagram has shown a light diffusion profile weighting function 401, and it can be by using one group of Wij value of light diffusion profile weight function matrix as shown in Figure 4 A to construct.So light diffusion profile 401 has represented to show that luminophor 301 sends the light distribution characteristics of light as far as possible., the light diffusion profile weighting function of a specific luminophor of a class or other eurypalynous luminophors can be determined by this way.
And, as above at piece 230 places, to mention, process, system and/or equipment can be at least in part based on one or more ambient light value, and determine one or more smooth diffusion profile weighting functions.
In certain embodiments, the surround lighting that ambient light value can be carried out by the ambient light sensor 160 as in Fig. 1 is measured and determines.Because exist various technology to go to determine ambient light value, so will list all these type of technology, be unpractiaca.The invention is not restricted to any particular technology or method for piece 230, but there is a kind of exemplary method to use, a kind of technology of describing in the U.S. patent application case that the sequence number that is " Method; system or apparatus for adjusting a brightness level associated with at least a portion of a backlight of a display device (for adjusting method, the system or equipment of display device at least a portion intensity level backlight) " as the title of filing an application on September 23rd, 2009 is 12/565,635.The simplification narration of this technology will be in following description.
According to patent application case referred to above, for example ambient light value can Lux (lux) be measured for unit.In certain embodiments, according to the amount of institute's sensing, the measured or Lux that detects, process, system or equipment can be determined the specific distribution of light diffusion profile weighting function at piece 230 places.In general, the ambient light value of the higher Lux of correspondence (as brighter) ambient lighting condition can cause the determining of light diffusion profile weighting function of " steeper ", and the ambient light value of the lower Lux of correspondence (as darker) ambient lighting condition can cause the determining of light diffusion profile weighting function of " more level and smooth ".
For example, Fig. 5 shows according to one or more embodiment and the various exemplary distribution of definite light diffusion profile weighting function, and it can be used for adjusting the intensity level of the one or more luminophors of at least part of lateral direction light emission formula of display device on backlight.
In Fig. 5, provide the ambient lighting condition scale 500 can be based on one or more ambient light value and definite distribution pattern to show as exemplary reference.About this scale, it should be noted that the environment light condition of correspondence " secretly " or " bright " and any numerical value of mark is only for graphic extension object.Similarly, exemplary light diffusion profile weighting function 501 and 502 is depicted as correspondence " secretly " or " bright " ambient light value, also with explaining.And, although two example distribution are only provided, it should be noted that and can determine multiple distribution shape, they are omitted is for not fuzzy theme of the present invention.Therefore, the scope of the invention is not limited to these graphic extensions or example.
Herein, in Fig. 5, first scale 500 describes the ambient lighting condition of " bright ", and as the ambient lighting condition corresponding to surpassing the lux value of about 4000lux, this is only an example.Under this ambient lighting condition, can determine light diffusion profile weighting function 501.On the contrary, the ambient lighting condition of " secretly ", as corresponding to 0 ambient light intensity arriving between about 200lux, can determine that the local weighted function of " smoothly " is as distribution weighting function 502.
What it should be noted that Fig. 5 describes herein is nonlinear scale, and the feature of the lux of corresponding " secretly " or " bright " environment light condition, changes according to the variation of the brightness apperceive characteristic of human eye, and this intensity of variation is nonlinear.At this, lux feature is corresponding to the expression of " secretly " or " bright " ambient lighting condition, be only for convenience of and for simplicity.Therefore, theme of the present invention is not subject to this feature limits.
In certain embodiments, can determine the distribution weighting function of specific distribution, to produce specific display characteristic.For instance, the distribution 502 of the ambient lighting condition of " secretly ", for between the adjacent one or more luminophors of a specific luminophor at least a portion being placed on display device side direction light emitting type backlight and/or middle contrast, can play the effect that reduces contrast.Similarly, distribute 501, for being placed between one or more luminophors that a specific luminophor at least a portion of display device side direction light emitting type backlight is adjacent and/or middle contrast, can play the effect that increases contrast.As according to above, can determine based on various ambient light value various distribution shapes; Therefore, the scope of minute subject matter is not limited to this type of graphic extension or example.
As mentioned above, at piece 230 places, process, system or equipment can be at least in part based on one or more numerical value and one or more ambient light value that represent one or more smooth diffusion profile, and determine one or more smooth diffusion profile weighting functions.Therefore in certain embodiments, process, system or equipment can be determined one or more smooth diffusion profile weighting functions, it can be the combination of normalized smooth diffusion profile numerical value, as one group of Wij value of the light diffusion profile weight function matrix of describing from Fig. 4 A, they also will be further adjusted by using one or more ambient light value.
For example, as mentioned above, process, system or equipment first the light spread function based on a specific luminophor are determined a weighting matrix " W ".Herein, this weighting matrix " W " can normalization, maximal value=1.0 (referring to following matrix).
Then, process, system or equipment, can determine an ambient lighting condition and be used in the following equation about W.
W
A＝α·W
γ
In this equation, " A " represents environment light condition, and α is enhancer, and it can be less than 1.0 under dark environment, under bright environment, is greater than 1.0, is only example.And the γ in above equation can be for controlling the flatness of weighting function.For example, in dark situation, 0 < γ < 1.0, wherein γ is less, and result function is just more level and smooth.On the contrary, in bright ring border, γ > 1.0, wherein γ is larger, and curve is just steeper.This process will be in following more detailed description.
Piece 240 in Fig. 2, process, system or equipment can be by one or more smooth diffusion profile weighting functions, one or more image feature values (as one or more subdivision typical values) are carried out to filtering, to produce one or more preliminary luminophor brightness values.This process will be in following more detailed description.
In certain embodiments, piece 250 places at Fig. 2, process, system or equipment can pass through one or more functions of time, one or more brightness values (as one or more preliminary luminophor brightness values) are carried out to filtering, to produce one or more luminophor brightness values.The weighting brightness value of result can be applied to one or more luminophors, is placed in the brightness of at least one luminophor of lateral direction light emission formula on backlight to be adjusted to small part.
As mentioned above, in this literary composition, the function of time comprises such function, and it is applied to one or more brightness values (as one or more preliminary luminophor brightness values) of present frame; And at least one previous signal controlling value that is applied to one or more specific luminophors.
In order to describe an exemplary embodiment of time filtering, suppose that a specific luminous body position is in position (i, j).To this luminophor, as mentioned above, process, system or equipment can be determined a preliminary luminophor brightness value (preliminary brightness value=max (W of the luminophor of locating as position (i, j)
ar), W wherein
abe illustrated in the light diffusion profile weighting function under environment light condition A, R represents the typical value matrix of luminophor (i, j)).
Then, for one or more or each be placed at least partly the luminophor of lateral direction light emission formula on backlight, process, system or equipment can be determined one or more preliminary luminophor brightness values.In this example, on display, each luminophor has been determined the luminophor brightness value that at least one is preliminary if, and process, system or equipment are just selected maximum preliminary light emission body brightness value under present frame so, and are labeled as the maxLED when time T
t.For example, in Fig. 6,601 are presented at the maxLED. of time 3
Next process, system or equipment implement the following function of time:
LED (i, j)
t=max[environment weight * maxLED
t, LED (i, j), α * (LED (i, j)
t-1)]
Herein, this function of time has been shown the LED that locates at position (i, the j) brightness when time T, is selected as three maximal values in value.For example, first value is " environment weight * maxLED
t".Particular display frame when this value can be for control time T, because minimum LED value should not be less than " environment weight * maxLED
t" (as 0 < environment weight < 1).Under bright environmental baseline, be only an example, can select compared with circlet border weight, so the difference between the minimum and maximum LED of a frame is sizable, therefore obtain higher contrast.On the contrary, under dark environmental baseline, larger environment weight can be selected, so the difference between the minimum and maximum LED of a frame is quite little, therefore halation problem can be reduced, if present.
Second value in the function of time is above LED (i, j).This value can be the preliminary luminophor brightness value calculating as mentioned above.602 LED (i, j) that are presented at times 3 place in Fig. 6 for example.
The 3rd value in the function of time is above α * (LED (i, j)
t-1).Herein, α is the weight in [0,1] scope, and wherein larger α represents the milder conversion from frame T-1 to T.Therefore, LED (i, j)
t-1can be the brightness value of the LED that locates of position (i, j) when former frame T-1.For example in Fig. 6,603 be presented at times 2 places and have preliminary luminophor brightness LED (i, j)
t-1, the time 2 be the T-1 time.But, in certain embodiments, LED (i, j)
t-1can not limit is the preliminary light emission body brightness value of former frame, for example can use other brightness values, the luminophor brilliance control value as time T-1 o'clock, maybe can represent position (i, j) LED locating is at other signal values of the brightness of time T-1, and this is only some examples.
In addition, in certain embodiments, can use extra distance weighting.For example, in certain embodiments, can use the following function of time:
LED (i, j)
t=max[environment weight * maxLED
t* distance weighting, LED (i, j), α * (LED (i, j)
t-1)]
Increased " distance weighting " component herein, for first value.In this embodiment, the LED that distance weighting component and position (i, j) locate and preliminary light emission body brightness value maxLED maximum under present frame
tdistance between (as preliminary luminophor brightness value) is inversely proportional to.
Fig. 7 shows the effect of the time filtering of having used distance weighting component.For example, in Fig. 7, the brightness of one or more luminophors of the adjacent high light luminophor of parapet can be lighted and/or increase to distance weighting component.Similarly, distance weighting component can lower to be lighted, and/or reduces the brightness away from one or more luminophors of high light luminophor.This distance weighting can be for alleviating halation problem.
At piece 260, process, system or equipment can be by the brightness value of one or more weightings being applied to be placed on the luminous one or more luminophors on backlight of display device side direction, and adjust the brightness of one or more luminophors.
For process or the operations that illustrate that some are above, suppose that the control circuit 140 in Fig. 1 can adjust the brightness of the luminophor that in Fig. 8 A, position (i, j) locates.For example, control circuit 140 can the one or more image input signal values of access herein (they are that control circuit 140 is manageable, or processed, to produce one or more image feature values, as subdivision typical value), the luminophor in these signal value corresponding diagram 8A.For the purpose of illustrating, suppose that the subdivision typical value of the luminophor in Fig. 8 A is described and determined (as typical value=Max (Peak by above-mentioned patented claim
m, n)), and the example values being shown by Fig. 8 A represents.
In this example, control circuit 140 can be at least in part based on one or more numerical value and/or one or more ambient light value that represent one or more smooth diffusion profile, and determine one or more smooth diffusion profile weighting functions.Here, the exemplary numerical value that represents light diffusion profile weighting function is as Fig. 8 B demonstration.
Typical value in Fig. 8 A can be carried out filtering by the light diffusion profile weighting function in Fig. 8 B, to produce exemplary preliminary light emission body brightness value, as shown in Figure 8 C.Therefore, as shown in Figure 8 C, max (W
athe preliminary light emission body brightness value of the luminophor that example results numerical value 157 R) equals to locate at (i, j).And, as mentioned above, these values can be applied to luminophor and/or other filtering of experiencing on, as time filtering, this is only an example.
In certain embodiments, in some devices or structure, luminophor (as backlight in lateral direction light emission formula) and LCD panel, as backlight in lateral direction light emission formula 120 and LCD panel 130, can connect by control circuit, make the transmissivity that control circuit can operation adjustment liquid crystal, respond at least in part from luminophor and incide the light LCD panel.Therefore, as an example, control circuit can be adjusted the transmissivity of LCD panel, to respond one or more adjustment backlight, as the adjustment based on foregoing ambient light value at least partly.Certainly, this LCD adjusts and can be controlled by one or more parts or device, and for convenience of description, they do not show in Fig. 1.For example, lateral direction light emission formula backlight 120 and LCD panel 130 can have various processors, control circuit or device, and they control one or more cooperations between lateral direction light emission formula backlight 120 and LCD panel 130.But for simplicity, and for not fuzzy theme of the present invention, these parts or device have all omitted; On the contrary, in embodiment 100, control circuit 140 can be carried out one or more to these various parts or install relevant function.
For example, in certain embodiments, at piece 270 places, one or more processors or device be as control circuit 140, can be at least in part in response to the image signal value of one or more LCD panels because of the corresponding adjustment of backlight intensity adjustment.Implementation method is: control circuit 140 can be processed one or more received image signal values with one or more local shading manipulation technologies.In the case, local shading manipulation technology can comprise arbitrary technology or the method for the intensity level of optionally modulating LCD transmissivity.Owing to there being various local shading technology, it will be unpractical therefore listing all these type of technology.Then, should note, although theme of the present invention is not limited to arbitrary particular technology or method, but there is a kind of local shading to handle exemplary method and can be used for piece 270, the title of filing an application on September 23rd, 2009 is as the aforementioned " Method, system or apparatus for adjusting a brightness level associated with at least a portion of a backlight of a display device is (for adjusting the method for display device at least a portion intensity level backlight, system or equipment) " sequence number is 12/565, 635 U.S. patent application case.At piece 280 places, one or more processes or operation can be applied the transmissivity that one or more values of processing via one or more local shading manipulation technologies are adjusted the LCD panel of display device.
Some embodiment or embodiment can have multiple advantage.For instance, the exemplary advantage of at least one embodiment comprises improvable power saving and heat management characteristic.In certain embodiments, power saving and heat management can be partly due to based on being incident in particular display device or around the surround lighting of described display device, the localization adjustment of backlight intensity being improved.In addition, the exemplary advantage of the display characteristic of at least one embodiment comprises improvable contrast or colouristic properties ratio, is only an example.And at least one embodiment, time filtering can alleviate halation phenomenon, this is also another advantage.
In addition, embodiment is with reference to forming the accompanying drawing of a part herein, wherein this instructions in the whole text in same reference numeral same parts to indicate correspondence or similar element.Should be appreciated that, for the purpose of simple and clear or clear description, the element described in figure may not be drawn in proportion.For instance, for clarity, can amplify with respect to other element the size of some elements in described element.In addition, should be understood that and can utilize other embodiment and in the situation that not deviating from subject area of the present invention, make structure or change in logic.It shall yet further be noted that can user to and for example, with reference to (, upper and lower, top, bottom etc.), promote the discussion to accompanying drawing, be not intended to limit the application of theme of the present invention.Therefore, embodiment should not be considered as having limited significance, and example, description or the subject area of the present invention being defined by appended claims and equivalent thereof that do not limit like that.
As used herein, term " with ", "and/or" and "or" can comprise multiple meaning, described meaning depends on the context that described term is used at least in part.Conventionally, "and/or" and "or" are if for being associated list, and so for example A, B or C mean A, B and C (using by inclusive meaning) and A, B or C (using by exclusiveness meaning) herein herein.This instructions mentioned " embodiment " or " some embodiment " means to describe in conjunction with described embodiment in the whole text special characteristic, structure or characteristic are included at least one embodiment of theme of the present invention.Therefore, at this instructions each local phrase " in one embodiment " or " some embodiment " occurring in the whole text, may not refer to same embodiment completely.In addition, can be by special characteristic, structure or property combination in one or more embodiments.Embodiment described herein can comprise machine, device, engine or the equipment that uses digital signal running.This type of signal can comprise electronic signal, optical signalling, electromagnetic signal or the energy of arbitrary form of information is provided between position.
In previously describing, the various aspects of theme of the present invention have been described.For illustrative purposes, specifically numbering, system and/or configuration are for the thorough understanding to theme of the present invention is provided.Yet the those skilled in the art who benefits from this disclosure should understand, can there is no under the situation of described detail, to put into practice theme of the present invention.In other situation, for not fuzzy theme of the present invention, the feature that one of ordinary skill in the art understand is omitted or simplifies.Although graphic extension or described some feature herein, one of ordinary skill in the art will expect now many modifications, substitute, change or equivalent.Therefore, should understand appended claims and intend to contain this type of modification or the change in all true spirits that belong to theme of the present invention.
Claims (16)
1. a method of adjusting the intensity level of lateral direction light emission formula backlight display device, comprising:
The one or more values that represent specific luminophor light diffusion profile of access, wherein said specific luminophor is a lateral direction light emission formula part backlight in display device;
The one or more image input values of access;
Process image input value described at least one, to produce the one or more image feature values that are associated with one or more luminophors;
Based on described value and the described image feature value that represents specific luminophor light diffusion profile, by adjusting the one or more brightness values that are associated with described specific luminophor, and adjust the brightness of described specific luminophor at least in part;
Wherein, by one or more functions of time, one or more image feature values by the filtering of light diffusion profile weighting function are carried out to filtering.
2. the method for claim 1, wherein said one or more image feature values comprise one or more subdivision typical values.
3. the method for claim 1, also comprises:
At least part of based on one or more described values that represent the light diffusion profile of specific luminophor, or the measured value of one or more ambient light value, or its combination, and determine one or more smooth diffusion profile weighting functions.
4. method as claimed in claim 3, wherein said one or more functions of time are that the image feature value of the one or more smooth diffusion profile weighting function filtering by determining is carried out to filtering, to produce one or more weighting brightness values.
5. method as claimed in claim 4, also comprises:
One or more described weighting brightness values are applied on the one or more luminophors on display device side direction light emitting type backlight.
6. a device of adjusting the intensity level of lateral direction light emission formula backlight display device, comprising:
Lateral direction light emission formula is backlight, and it comprises a plurality of luminophors;
LCD panel, it is backlight that it is connected to described lateral direction light emission formula;
Control circuit, it is electrically connected to described lateral direction light emission formula LCD panel backlight and described, and wherein said control circuit can the one or more image input signal values of access; Wherein said control circuit can also be processed described at least one image input signal value to produce the one or more image feature values that are associated with one or more luminophors, wherein said control circuit is at least in part based on one or more value and described image feature values that represent the light diffusion profile of specific luminophor in described a plurality of luminophor, adjust the brightness of specific luminophor in described a plurality of luminophor, wherein, by one or more functions of time, one or more image feature values by the filtering of light diffusion profile weighting function are carried out to filtering.
7. device as claimed in claim 6, wherein said control circuit can be by one or more smooth diffusion profile weighting functions, and one or more described image feature values are carried out to filtering.
8. device as claimed in claim 7, wherein said control circuit can be applied to one or more described filter values by one or more smooth diffusion profile weighting functions on the one or more luminophors on display device side direction light emitting type backlight.
9. device as claimed in claim 6, wherein said control circuit can also use one or more local shading operative techniquies, processes one or more image input signal values.
10. device as claimed in claim 6, wherein said control circuit can also be by by one or more values of using one or more local shading operative techniquies to produce, be applied to described at least a portion on LCD panel, to adjust at least in part one or more LCD pixel values.
11. devices as claimed in claim 6, also comprise:
At least one ambient light sensor, wherein said ambient light sensor can measure be incident in described display device or around the surround lighting of described display device to determine one or more ambient light value.
12. devices as claimed in claim 6, wherein said control circuit can be at least in part based on one or more described values that represent the light diffusion profile of specific luminophor, or the measured value of one or more ambient light value, or its combination, and determine one or more smooth diffusion profile weighting functions.
13. devices as claimed in claim 6, in wherein said a plurality of luminophors, at least one luminophor comprises at least one light emitting diode.
14. devices as claimed in claim 6, wherein said lateral direction light emission formula backlight display device comprises described luminophor, described LCD panel and described control circuit.
15. devices as claimed in claim 14, wherein said lateral direction light emission formula backlight display device comprises that at least one is with lower device: televisor, handheld device, computer equipment or its combination.
16. 1 kinds of devices of adjusting the intensity level of lateral direction light emission formula backlight display device, comprising:
For the one or more devices that represent the value of specific luminophor light diffusion profile of access, wherein said specific luminophor is a lateral direction light emission formula part backlight in display device;
For adjusting the device of described specific luminophor brightness, they can the one or more image input signal values of access, can also process described at least one image input signal value to produce the one or more image feature values that are associated with one or more luminophors, it is at least in part based on the described value that represents described specific luminophor light diffusion profile and described image feature value and adjust one or more brightness values of described specific luminophor, wherein by one or more functions of time, one or more image feature values by the filtering of light diffusion profile weighting function are carried out to filtering.
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| US13/343,667 | 2012-01-04 | ||
| US13/343,667 US9129565B2 (en) | 2010-03-26 | 2012-01-04 | Adjusting a brightness level of a side emitting backlight display device using light spreading profiles |
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| CN107180616A (en) * | 2016-03-11 | 2017-09-19 | 青岛海信电器股份有限公司 | A kind of method for eliminating display device Mura, elimination display device Mura devices and display device |
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| CN1955795A (en) * | 2005-10-28 | 2007-05-02 | 三星电子株式会社 | Display apparatus having led backlight and brightness adjusting method for the same |
| CN101290744A (en) * | 2007-04-20 | 2008-10-22 | 联咏科技股份有限公司 | Luminance compensating mechanism and method for backlight module |
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| JP4628770B2 (en) * | 2004-02-09 | 2011-02-09 | 株式会社日立製作所 | Image display device having illumination device and image display method |
| KR101333680B1 (en) * | 2007-04-12 | 2013-12-02 | 삼성전자주식회사 | Display apparatus and method of adjusting brightness for the same |
| CN101281730A (en) * | 2008-03-20 | 2008-10-08 | 青岛海信电器股份有限公司 | Liquid crystal display method |
| US8890793B2 (en) * | 2010-03-26 | 2014-11-18 | Hong Kong Applied Science and Technology Research Institute, Co. Ltd. | Adjusting a brightness level of a backlight of a display device |
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| CN1875311A (en) * | 2003-10-28 | 2006-12-06 | 三星电子株式会社 | Display and control method thereof |
| CN1955795A (en) * | 2005-10-28 | 2007-05-02 | 三星电子株式会社 | Display apparatus having led backlight and brightness adjusting method for the same |
| CN101290744A (en) * | 2007-04-20 | 2008-10-22 | 联咏科技股份有限公司 | Luminance compensating mechanism and method for backlight module |
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